Community Discussions and Support
Error Forwarding Messages

Ok, I think I found out (may be) what is going wrong....

I am using idw's S/MIME Front-End for email encryption.

But for few of my recipients I was unchecking the "Encrypt.." check-box for specific emails, as they had complained about some error regarding email certificate on their side (outlook express) while accessing my mail.

That's where the problem lies. If I  uncheck the "Encrypt.." box for a particular mail, I end up invariably with -

>> 0046 354 Start mail input; end with <CRLF>.<CRLF>

7: Socket read error 2746. 

error while sending such mails .

But if I don't uncheck Encrypt check-box, the same mails (new/reply/forward) go through properly.

How can we address this issue?

Thanks & Regards,

Rad.

 

&lt;p&gt;Ok, I think I found out (may be) what is going wrong....&lt;/p&gt;&lt;p&gt;I am using idw&#039;s S/MIME Front-End for email encryption.&lt;/p&gt;&lt;p&gt;But for few of my&amp;nbsp;recipients&amp;nbsp;I was unchecking the &quot;Encrypt..&quot;&amp;nbsp;check-box&amp;nbsp;for specific emails, as they had complained about some error regarding email certificate on their side (outlook express) while accessing my mail.&lt;/p&gt;&lt;p&gt;That&#039;s where the problem lies. If I &amp;nbsp;uncheck the &quot;Encrypt..&quot; box for a particular mail, I end up invariably with -&lt;/p&gt;&lt;div style=&quot;font-family: Tahoma, Arial, Helvetica; font-size: 12px; text-align: left; &quot;&gt;&amp;gt;&amp;gt; 0046 354 Start mail input; end with &amp;lt;CRLF&amp;gt;.&amp;lt;CRLF&amp;gt;&lt;/div&gt;&lt;p&gt;&lt;span style=&quot;font-family: Tahoma, Arial, Helvetica; font-size: 12px; text-align: left; &quot;&gt;7: Socket read error 2746.&lt;/span&gt;&amp;nbsp;&lt;/p&gt;&lt;p&gt;error while sending such mails .&lt;/p&gt;&lt;p&gt;But if I don&#039;t uncheck Encrypt check-box, the same mails (new/reply/forward) go through properly.&lt;/p&gt;&lt;p&gt;How can we address this issue?&lt;/p&gt;&lt;p&gt;Thanks &amp;amp; Regards,&lt;/p&gt;&lt;p&gt;Rad.&lt;/p&gt;&lt;p&gt;&amp;nbsp;&lt;/p&gt;

Hi,

My set-up: WinXP Pro SP3 + PMail 4.63 + IERenderer 2.4.7.4

I am having trouble forwarding any mail originated from my side.
Following error is displayed while sending the mail:

Connection timeout. No response from host.

[*] Connection established to 203.199.83.244
>> 0036 220 webmail39.rediffmail.com ESMTP
<< 0022 EHLO [49.15.161.239]
>> 0030 250-webmail39.rediffmail.com
>> 0016 250-PIPELINING
>> 0014 250 8BITMIME
<< 0034 MAIL FROM:<radhx@rediffmail.com>
>> 0008 250 ok
<< 0027 RCPT TO:<hxrad@yahoo.com>
>> 0008 250 ok
<< 0006 DATA
>> 0046 354 Start mail input; end with <CRLF>.<CRLF>
7: Socket read error 2746.

I can forward mails which I receive but which are without any attachment(s). Received mails with attachment(s) give out same error.

I use a signature. I have tried sending mails with as well as without signature, but having same result as above.

Pmail Info:
Pegasus Mail for Microsoft Windows
Copyright (C) 1992-2011, David Harris, all rights reserved
Electronic mail to support@pmail.gen.nz.

WinPMail version: Version 4.63 (Win32), Dec 22 2011, build ID 325
Language resources: Standard UK English resource set
Extension Manager version: 1.14
Operating mode: Standalone
User name and ID: admin, 0
Windows version: 5.1
Windows flag word: 0
WINPMAIL.EXE directory: D:\PMAIL\Programs
Home mailbox location: D:\PMAIL\MAIL\admin
New mailbox location: D:\PMAIL\MAIL\admin
TMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp
TEMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp
LAN-based SMTP support: N, N, N
NetWare MHS support: N, N, N
Built-in TCP/IP support: Enabled
  - WINSOCK version: WinSock 2.0
  - WINSOCK path: C:\WINDOWS\system32\WSOCK32.DLL
Commandline: -roam -A
Active -Z options: 33024
PMR variable: (None)
PML variable: (None)
MAI variable: (None)
NB variable: (None)
Autofiltering folders: 9 (9 active, 0 inactive)
Last new mail count: 1
Message size soft limit: 0 bytes
Message size hard limit: 0 bytes
Attachment size soft limit: 0 bytes
Attachment size hard limit: 0 bytes

Thanks & Regards,
Rad.

&lt;div&gt;Hi,&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;My set-up: WinXP Pro SP3 + PMail 4.63 + IERenderer 2.4.7.4&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;I am having trouble forwarding any mail originated from my side.&lt;/div&gt;&lt;div&gt;Following error is displayed while sending the mail:&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;Connection timeout. No response from host.&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;[*] Connection established to 203.199.83.244&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0036 220 webmail39.rediffmail.com ESMTP&lt;/div&gt;&lt;div&gt;&amp;lt;&amp;lt; 0022 EHLO [49.15.161.239]&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0030 250-webmail39.rediffmail.com&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0016 250-PIPELINING&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0014 250 8BITMIME&lt;/div&gt;&lt;div&gt;&amp;lt;&amp;lt; 0034 MAIL FROM:&amp;lt;radhx@rediffmail.com&amp;gt;&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0008 250 ok&lt;/div&gt;&lt;div&gt;&amp;lt;&amp;lt; 0027 RCPT TO:&amp;lt;hxrad@yahoo.com&amp;gt;&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0008 250 ok&lt;/div&gt;&lt;div&gt;&amp;lt;&amp;lt; 0006 DATA&lt;/div&gt;&lt;div&gt;&amp;gt;&amp;gt; 0046 354 Start mail input; end with &amp;lt;CRLF&amp;gt;.&amp;lt;CRLF&amp;gt;&lt;/div&gt;&lt;div&gt;7: Socket read error 2746.&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;I can forward mails which I receive but which are without any attachment(s). Received mails with attachment(s) give out same error.&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;I use a signature. I have tried sending mails with as well as without signature, but having same result as above.&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;Pmail Info:&lt;/div&gt;&lt;div&gt;Pegasus Mail for Microsoft Windows&lt;/div&gt;&lt;div&gt;Copyright (C) 1992-2011, David Harris, all rights reserved&lt;/div&gt;&lt;div&gt;Electronic mail to support@pmail.gen.nz.&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;WinPMail version: Version 4.63 (Win32), Dec 22 2011, build ID 325&lt;/div&gt;&lt;div&gt;Language resources: Standard UK English resource set&lt;/div&gt;&lt;div&gt;Extension Manager version: 1.14&lt;/div&gt;&lt;div&gt;Operating mode: Standalone&lt;/div&gt;&lt;div&gt;User name and ID: admin, 0&lt;/div&gt;&lt;div&gt;Windows version: 5.1&lt;/div&gt;&lt;div&gt;Windows flag word: 0&lt;/div&gt;&lt;div&gt;WINPMAIL.EXE directory: D:\PMAIL\Programs&lt;/div&gt;&lt;div&gt;Home mailbox location: D:\PMAIL\MAIL\admin&lt;/div&gt;&lt;div&gt;New mailbox location: D:\PMAIL\MAIL\admin&lt;/div&gt;&lt;div&gt;TMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp&lt;/div&gt;&lt;div&gt;TEMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp&lt;/div&gt;&lt;div&gt;LAN-based SMTP support: N, N, N&lt;/div&gt;&lt;div&gt;NetWare MHS support: N, N, N&lt;/div&gt;&lt;div&gt;Built-in TCP/IP support: Enabled&lt;/div&gt;&lt;div&gt;&amp;nbsp; - WINSOCK version: WinSock 2.0&lt;/div&gt;&lt;div&gt;&amp;nbsp; - WINSOCK path: C:\WINDOWS\system32\WSOCK32.DLL&lt;/div&gt;&lt;div&gt;Commandline: -roam -A&lt;/div&gt;&lt;div&gt;Active -Z options: 33024&lt;/div&gt;&lt;div&gt;PMR variable: (None)&lt;/div&gt;&lt;div&gt;PML variable: (None)&lt;/div&gt;&lt;div&gt;MAI variable: (None)&lt;/div&gt;&lt;div&gt;NB variable: (None)&lt;/div&gt;&lt;div&gt;Autofiltering folders: 9 (9 active, 0 inactive)&lt;/div&gt;&lt;div&gt;Last new mail count: 1&lt;/div&gt;&lt;div&gt;Message size soft limit: 0 bytes&lt;/div&gt;&lt;div&gt;Message size hard limit: 0 bytes&lt;/div&gt;&lt;div&gt;Attachment size soft limit: 0 bytes&lt;/div&gt;&lt;div&gt;Attachment size hard limit: 0 bytes&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;Thanks &amp;amp; Regards,&lt;/div&gt;&lt;div&gt;Rad.&lt;/div&gt;&lt;div&gt; &lt;/div&gt;

We really need to see a session log showing the sending process and the point of failure.  You can trim sections where encoded data is being transmitted to reduce the size of the data.

 

&lt;p&gt;We really need to see a session log showing the sending process and the point of failure.&amp;nbsp; You can trim sections where encoded data is being transmitted to reduce the size of the data.&lt;/p&gt;&lt;p&gt;&amp;nbsp;&lt;/p&gt;

How are you arriving at the Active -Z options: 33024 value shown? What is actual command line being  used to start winpm-32? Default value would be 32768 with no custom -z value used.

Are you experiencing any other tcp/ip failures or network connection failures?

&lt;p&gt;How are you arriving at the Active -Z options: 33024 value shown? What is actual command line being&amp;nbsp; used to start winpm-32? Default value would be 32768 with no custom -z value used. &lt;/p&gt;&lt;p&gt;Are you experiencing any other tcp/ip failures or network connection failures? &lt;/p&gt;

Hi Thomas,

Attached are 2 session logs (in SessionLogs.zip) for the same forwarded mail -

1] TCP0002.WPM - with signature

2] TCP0003.WPM - without signature

Thanks & Regards,

Rad.

 

&lt;p&gt;Hi Thomas,&lt;/p&gt;&lt;p&gt;Attached are 2 session logs (in SessionLogs.zip) for the same forwarded mail -&lt;/p&gt;&lt;p&gt;1] TCP0002.WPM - with signature&lt;/p&gt;&lt;p&gt;2] TCP0003.WPM - without signature&lt;/p&gt;&lt;p&gt;Thanks &amp;amp; Regards,&lt;/p&gt;&lt;p&gt;Rad.&lt;/p&gt;&lt;p&gt;&amp;nbsp;&lt;/p&gt;

Hi Jerry,

I am using one application launcher called "sTabLauncher" for launching PMail (jpg image attached).

The command line contains only "-roam -A" parameters.

No idea how the -Z option value is derived.

Sometimes even reply/mail with attachments produces the same error, but incoming mail is working fine.

Also, I have noticed that if I copy/paste contents from other mails (HTML) or from other applications, this <CR><LF> error pops up but not always.

Thanks  & Regards,

Rad.


&lt;p&gt;Hi Jerry,&lt;/p&gt;&lt;p&gt;I am using one application launcher called &quot;sTabLauncher&quot; for launching PMail (jpg image attached).&lt;/p&gt;&lt;p&gt;The command line contains only &quot;-roam -A&quot; parameters.&lt;/p&gt;&lt;p&gt;No idea how the -Z option value is derived.&lt;/p&gt;&lt;p&gt;Sometimes even reply/mail with attachments produces the same error, but incoming mail is working fine.&lt;/p&gt;&lt;p&gt;Also, I have noticed that if I copy/paste contents from other mails (HTML) or from other applications, this &amp;lt;CR&amp;gt;&amp;lt;LF&amp;gt; error pops up but not always.&lt;/p&gt;&lt;p&gt;Thanks &amp;nbsp;&amp;amp; Regards,&lt;/p&gt;&lt;p&gt;Rad.&lt;/p&gt;&lt;p&gt; &lt;/p&gt;

> Hi Thomas,
> Attached are 2 session logs (in SessionLogs.zip) for the same forwarded mail -
> 1] TCP0002.WPM - with signature
> 2] TCP0003.WPM - without signature
> Thanks & Regards,
> Rad.

The first one shows no error at all, just a normal closure

20:38:44.904 << 0074 Qk1mAQAAAAAAAHYAAAAoAAAAFAAAABQAAAABAAQAAAAAAPAAAAAiCwAAIgsAABAAAAAQAAAA\0D\0A
20:38:44.904 << 0074 AAAAAP///wDa2toA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\0D\0A
20:38:44.904 << 0074 AAAAAAAAAAAAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIi\0D\0A
20:38:44.904 << 0074 IiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIi\0D\0A
20:38:44.904 << 0074 IiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIi\0D\0A
20:38:44.904 << 0074 IiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIi\0D\0A
20:38:44.904 << 0050 IiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAAA==\0D\0A
20:38:44.904 << 0002 \0D\0A
20:38:44.904 << 0028 --Message-Boundary-20107--\0D\0A
20:38:44.904 << 0003 .\0D\0A
20:38:46.747 >> 0049 451 See http://pobox.com/~djb/docs/smtplf.html.\0D\0A
20:38:52.986 << 0006 QUIT\0D\0A
20:38:52.986 --- Connection closed normally at Wed, 20 Jun 2012 20:38:52. ---\0A\0A

And the second one also shows no failure but there was some sort of failure since the session log just quits without showing any error at all.

20:44:29.221 << 0002 \0D\0A
20:44:29.221 << 0074 Qk1mAQAAAAAAAHYAAAAoAAAAFAAAABQAAAABAAQAAAAAAPAAAAAiCwAAIgsAABAAAAAQAAAA\0D\0A
20:44:29.221 << 0074 AAAAAP///wDa2toA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\0D\0A
20:44:29.221 << 0074 AAAAAAAAAAAAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIi\0D\0A
20:44:29.221 << 0074 IiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIi\0D\0A
20:44:29.221 << 0074 IiIiIiIiIiIAACIiIiIiIiIiIiIAACIi

One thing to look at though.  The POP3/SMTP transmissions may fail if the MTU packet size is so large that a packet is fragmented.  In many cases the receiving system router blocks the receiving servers "packets fragmented" response to the sending system using "MTU Discovery".  These oversize packets are not accepted and so are resent.  This results in a timeout, generally at the end of the message transmission but it can be anywhere in the process.  You need to reduce the MTU size. Windows defaults to a 1500 MTU and many routers and DSL connections need 1492.  You might simply want to turn off the MTU Discovery operation.

You might want to get a copy of SG TCP Optimizer that I find quite handy.  http://www.speedguide.net/downloads.php  This little utility will allow you to test your MTU for maximum size without fragmentation against specific servers.  If will also make it easy to adjust the MTU.  

And finally, does this computer, by chance, happen to have an NVidia NForce 4 chipset on the motherboard?  If so, many other have had this exact problem, and it turned out to be an optimization setting for the built in NIC which caused the problems with packet fragmentation. Disabling the advanced optimization capability called "checksum offload" made all the problems of sending SMTP mail via WinPMail disappear.

&amp;gt; Hi Thomas, &amp;gt; Attached are 2 session logs (in SessionLogs.zip) for the same forwarded mail - &amp;gt; 1] TCP0002.WPM - with signature &amp;gt; 2] TCP0003.WPM - without signature &amp;gt; Thanks &amp;amp; Regards, &amp;gt; Rad. The first one shows no error at all, just a normal closure 20:38:44.904 &amp;lt;&amp;lt; 0074 Qk1mAQAAAAAAAHYAAAAoAAAAFAAAABQAAAABAAQAAAAAAPAAAAAiCwAAIgsAABAAAAAQAAAA\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0074 AAAAAP///wDa2toA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0074 AAAAAAAAAAAAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIi\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0074 IiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIi\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0074 IiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIi\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0074 IiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIi\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0050 IiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAAA==\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0002 \0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0028 --Message-Boundary-20107--\0D\0A 20:38:44.904 &amp;lt;&amp;lt; 0003 .\0D\0A 20:38:46.747 &amp;gt;&amp;gt; 0049 451 See http://pobox.com/~djb/docs/smtplf.html.\0D\0A 20:38:52.986 &amp;lt;&amp;lt; 0006 QUIT\0D\0A 20:38:52.986 --- Connection closed normally at Wed, 20 Jun 2012 20:38:52. ---\0A\0A And the second one also shows no failure but there was some sort of failure since the session log just quits without showing any error at all. 20:44:29.221 &amp;lt;&amp;lt; 0002 \0D\0A 20:44:29.221 &amp;lt;&amp;lt; 0074 Qk1mAQAAAAAAAHYAAAAoAAAAFAAAABQAAAABAAQAAAAAAPAAAAAiCwAAIgsAABAAAAAQAAAA\0D\0A 20:44:29.221 &amp;lt;&amp;lt; 0074 AAAAAP///wDa2toA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\0D\0A 20:44:29.221 &amp;lt;&amp;lt; 0074 AAAAAAAAAAAAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIi\0D\0A 20:44:29.221 &amp;lt;&amp;lt; 0074 IiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIiIiIiIiIiIiIAACIi\0D\0A 20:44:29.221 &amp;lt;&amp;lt; 0074 IiIiIiIiIiIAACIiIiIiIiIiIiIAACIi One thing to look at though.&amp;nbsp; The POP3/SMTP transmissions may fail if the MTU packet size is so large that a packet is fragmented.&amp;nbsp; In many cases the receiving system router blocks the receiving servers &quot;packets fragmented&quot; response to the sending system using &quot;MTU Discovery&quot;.&amp;nbsp; These oversize packets are not accepted and so are resent.&amp;nbsp; This results in a timeout, generally at the end of the message transmission but it can be anywhere in the process.&amp;nbsp; You need to reduce the MTU size. Windows defaults to a 1500 MTU and many routers and DSL connections need 1492.&amp;nbsp; You might simply want to turn off the MTU Discovery operation. You might want to get a copy of SG TCP Optimizer that I find quite handy.&amp;nbsp; http://www.speedguide.net/downloads.php&amp;nbsp; This little utility will allow you to test your MTU for maximum size without fragmentation against specific servers.&amp;nbsp; If will also make it easy to adjust the MTU. &amp;nbsp; And finally, does this computer, by chance, happen to have an NVidia NForce 4 chipset on the motherboard?&amp;nbsp; If so, many other have had this exact problem, and it turned out to be an optimization setting for the built in NIC which caused the problems with packet fragmentation. Disabling the advanced optimization capability called &quot;checksum offload&quot; made all the problems of sending SMTP mail via WinPMail disappear.

[quote user="Thomas R. Stephenson"]

The first one shows no error at all, just a normal closure
And the second one also shows no failure but there was some sort of failure since the session log just quits without showing any error at all.

[/quote]

But both the forwarded mails didn't go through with aforesaid error as I am forwarding them to my other yahoo id. 

 

[quote user="Thomas R. Stephenson"]

You need to reduce the MTU size. Windows defaults to a 1500 MTU and many routers and DSL connections need 1492.  You might simply want to turn off the MTU Discovery operation.

Disabling the advanced optimization capability called "checksum offload" made all the problems of sending SMTP mail via WinPMail disappear.

[/quote] 

I used SG TCP Optimizer as suggested but getting same error.

 

[quote user="Thomas R. Stephenson"]

And finally, does this computer, by chance, happen to have an NVidia NForce 4 chipset on the motherboard?

[/quote] 

No, I have Intel on-board graphics chip. This is old Sony VAIO VGN-B66SP model of 2005.


I tried to forward text mails and they didn't have any issues.
Looks like something to do with HTML mails only.
 
Thanks & Regards,
Rad. 

 
&lt;p&gt;[quote user=&quot;Thomas R. Stephenson&quot;] &lt;/p&gt;&lt;p&gt;The first one shows no error at all, just a normal closure And the second one also shows no failure but there was some sort of failure since the session log just quits without showing any error at all. &lt;/p&gt;&lt;p&gt;[/quote] &lt;/p&gt;&lt;p&gt;But both the forwarded mails didn&#039;t go through with aforesaid error as I am forwarding them to my other yahoo id.&amp;nbsp;&lt;/p&gt;&lt;p&gt;&amp;nbsp;&lt;/p&gt;&lt;p&gt;[quote user=&quot;Thomas R. Stephenson&quot;]&lt;/p&gt;&lt;p&gt;You need to reduce the MTU size. Windows defaults to a 1500 MTU and many routers and DSL connections need 1492.&amp;nbsp; You might simply want to turn off the MTU Discovery operation.&lt;/p&gt;&lt;p&gt;Disabling the advanced optimization capability called &quot;checksum offload&quot; made all the problems of sending SMTP mail via WinPMail disappear.&lt;/p&gt;&lt;p&gt;[/quote]&amp;nbsp;&lt;/p&gt;&lt;p&gt;I used SG TCP Optimizer as suggested but getting same error.&lt;/p&gt;&lt;p&gt;&amp;nbsp;&lt;/p&gt;&lt;p&gt;[quote user=&quot;Thomas R. Stephenson&quot;]&lt;/p&gt;&lt;p&gt;And finally, does this computer, by chance, happen to have an NVidia NForce 4 chipset on the motherboard?&lt;/p&gt;&lt;p&gt;[/quote]&amp;nbsp;&lt;/p&gt;&lt;p&gt;No, I have Intel on-board graphics chip. This is old Sony VAIO VGN-B66SP model of 2005.&lt;/p&gt; &lt;div&gt;I tried to forward text mails and they didn&#039;t have any issues.&lt;/div&gt;&lt;div&gt;Looks like something to do with HTML mails only.&lt;/div&gt;&lt;div&gt;&amp;nbsp;&lt;/div&gt;&lt;div&gt;Thanks &amp;amp; Regards,&lt;/div&gt;&lt;div&gt;Rad.&amp;nbsp;&lt;/div&gt;&lt;div&gt; &lt;/div&gt;&lt;div&gt;&amp;nbsp;&lt;/div&gt;

> But both the forwarded mails didn't go through with aforesaid error as I am forwarding them to my other yahoo id.

The first session log shows the message was sent completely to the receiving SMTP relay host (smtp.rediffmail.com). It may have been rejected later by Yahoo but there was no failure at all with Pegasus Mail sending.

&lt;p&gt;&amp;gt; But both the forwarded mails didn&#039;t go through with aforesaid error as I am forwarding them to my other yahoo id. &lt;/p&gt;&lt;p&gt;The first session log shows the message was sent completely to the receiving SMTP relay host (smtp.rediffmail.com). It may have been rejected later by Yahoo but there was no failure at all with Pegasus Mail sending. &lt;/p&gt;
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