<p>> I tried to disable MTU Discovery in TCP Optimzer, but after reboot it always gets enabled somehow. > Are you sure?  Did you check the settings of "<b>Enable PMTUDiscovery</b>" in registry?  If it's old value is 0 then it turned off.  The easiest way to do this is to hit the custom button, hit apply and look at the "Old value" setting. > > I also tried disabling checksum offloading in TCP Optimizer but it too had no effect. Check <b>DisableTaskOffload</b> the same way as above or use regedit. > > > The previous WinPMail version 4.51 had no issues with attachments.</p><p>Not sure why since there are almost no changes in this area between the 2 versions.  I really suspect that something has changed in the path between Pegasus Mail and the server. </p><p> </p>

<div>Hi,</div><div> </div><div>My Setup is -  WinXP Pro SP2 + PMail 4.61 + Mercury 4.73</div><div> </div><div>Sending mails with attachments (usually doc, zip, 7z files) fails with following trace:</div><div>================================</div><div>SMTP Network and Protocol Sending Error:</div><div>Connection timeout (no response from host)</div><div> </div><div>Trace:</div><div>[*] Connection established to 203.199.83.244</div><div>>> 0036 220 webmail39.rediffmail.com ESMTP</div><div><< 0020 EHLO [192.168.0.1]</div><div>>> 0030 250-webmail39.rediffmail.com</div><div>>> 0016 250-PIPELINING</div><div>>> 0014 250 8BITMIME</div><div><< 0034 MAIL FROM:<radhx@rediffmail.com></div><div>>> 0008 250 ok</div><div><< 0029 RCPT TO:<radhx99@gmail.com></div><div>>> 0008 250 ok</div><div><< 0006 DATA</div><div>>> 0046 354 Start mail input; end with <CRLF>.<CRLF></div><div>8: Socket read timeout.</div><div>================================</div><div> </div><div>But though sending fails and mail remains in the queue, in fact many times (but not all) it has been sent properly as I can download it from receiving account.</div><div> </div><div>Tried sending attachments with varying sizes - <1MB, <2MB, <3MB etc. but getting same result. The sending process (percentage display) stops/hangs anywhere in-between 50% and 100%, never reaching 100%.</div><div> </div><div>I get 2 mails one from Mail Delivery System with subject "Mail Delivery Failure" in new mails folder and other an empty mail from Unknown with subject "None".</div><div> </div><div>Mail Delivery Failure Details:</div><div>============================== </div><div>Delivery has failed on the enclosed message for the following</div><div>reasons reported either by the mail delivery system on the mail</div><div>relay host or by the local TCP/IP transport module:</div><div> </div><div>   *** TCP/IP error while processing job ***</div><div>   A network error has occurred while WinPMail attempted to send</div><div>   your message. This error could be caused by many conditions,</div><div>   including the following:</div><div>     * The remote host may have gone down.</div><div>     * Your network may have been broken or gone down.</div><div>     * You may have a configuration problem in your WINSOCK.DLL.</div><div>     * If running on a SLIP line, you may have experienced a</div><div>       timeout (increase the value in WinPMail's Network Config.</div><div>       Dialog), or the phone line may have gone down or suffered</div><div>       from excessive line noise.</div><div>   WinPMail will requeue your message and try again later.</div><div>   ---</div><div> </div><div>Your original mail message follows:</div><div>--------------------------------------------------------</div><div> </div><div>X-PM-Identity: <Default></div><div>From: "Rajesh A. Deshpande" <radhx@rediffmail.com></div><div>Organization: RadianSoft</div><div>To: radhx99@gmail.com</div><div>Date: Wed, 27 Jul 2011 15:58:45 +0530</div><div>MIME-Version: 1.0</div><div>Content-type: Multipart/Mixed; boundary=Message-Boundary-1701</div><div>Subject: Test Msg > 2mb att</div><div>Message-ID: <4E2FE85D.8611.159D6B0@radhx.rediffmail.com></div><div>X-Confirm-Reading-To: "Rajesh A. Deshpande" <radhx@rediffmail.com></div><div>X-pmrqc: 1</div><div>Return-receipt-to: "Rajesh A. Deshpande" <radhx@rediffmail.com></div><div>Priority: normal</div><div>X-mailer: Pegasus Mail for Windows (4.61)</div><div> </div><div> </div><div>--Message-Boundary-1701</div><div>Content-type: Multipart/Related; boundary="Message-Boundary-17282"</div><div> </div><div>--Message-Boundary-17282</div><div>Content-type: Multipart/Alternative;</div><div>boundary="Alt-Boundary-29032.22664880"</div><div> </div><div>--Alt-Boundary-29032.22664880</div><div>Content-type: text/plain; charset=US-ASCII</div><div>Content-transfer-encoding: 7BIT</div><div>Content-description: Mail message body</div><div> </div><div>Test Msg > 2mb att</div><div> </div><div> </div><div> </div><div> </div><div>--</div><div>Thanks & Regards,</div><div>Rajesh A. Deshpande.</div><div> </div><div> </div><div>===================</div><div>Thoughts For The Day :</div><div>===================</div><div> </div><div>None... at the moment....</div><div> </div><div> </div><div> P Consider the environment. ? Please don't print, unless you really need</div><div>to.</div><div>This e-mail message may contain proprietary, confidential or legally</div><div>privileged </div><div>information for the sole use of the person or entity to whom this message</div><div>was </div><div>originally addressed. Any review, e-transmission dissemination or other</div><div>use of or </div><div>taking of any action in reliance upon this information by persons or</div><div>entities other than </div><div>the intended recipient is prohibited. If you have received this e-mail in</div><div>error kindly </div><div>delete this e-mail from your records. If it appears that this mail has</div><div>been forwarded to </div><div>you without proper authority, please notify us immediately at</div><div>radhx@rediffmail.com </div><div>and delete this mail. </div><div> </div><div> </div><div>--Alt-Boundary-29032.22664880</div><div>Content-type: text/html; charset=US-ASCII</div><div>Content-transfer-encoding: 7BIT</div><div>Content-description: Mail message body</div><div> </div><div><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"</div><div>          "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></div><div><html  xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"</div><div>lang="en"><head></div><div><title></title></div><div><meta http-equiv="content-type" content="text/html;charset=utf-8"/></div><div><meta http-equiv="Content-Style-Type" content="text/css"/></div><div></head></div><div><body></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt">Test Msg > 2mb att</span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"> </div><div></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"> </div><div></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"> </div><div></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"> </div><div></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt">--</span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"><b>Thanks & Regards,</b></span></font></div></div><div><div align="left"><font face="Arial" color="#0000ff" size="2"><span</div><div>style=" font-size:10pt"><b>Rajesh A. Deshpande.</b></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"><b> </div><div></b></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"><b> </div><div></b></span></font></div></div><div><div align="left"><font face="Arial" color="#ff0000" size="2"><span</div><div>style=" font-size:10pt"><b>===================</b></span></font></div></div><div><div align="left"><font face="Arial" color="#ff0000" size="2"><span</div><div>style=" font-size:10pt"><b>Thoughts For The Day</div><div>:</b></span></font></div></div><div><div align="left"><font face="Arial" color="#ff0000" size="2"><span</div><div>style=" font-size:10pt"><b>===================</b></span></font></div></div><div><div align="left"><font face="Arial" color="#7f007f" size="2"><span</div><div>style=" font-size:10pt"><b> </div><div></b></span></font></div></div><div><div align="left"><font face="Arial" color="#7f007f" size="2"><span</div><div>style=" font-size:10pt"><b>None... at the</div><div>moment....</b></span></font></div></div><div><div align="left"><font face="Arial" color="#7f007f" size="2"><span</div><div>style=" font-size:10pt"><b> </div><div></b></span></font></div></div><div><div align="left"><font face="Arial" size="2"><span style="</div><div>font-size:10pt"><b> </div><div></b></span></font></div></div><div><p style="margin-left:0mm; margin-right:0mm; text-indent:0mm;</div><div>margin-top:1.76mm; margin-bottom:1.76mm;"></div><div><hr size="1pt" width="100%" align="left"/></div><div><font face="Times New Roman"><span style=" font-size:12pt"></div><div></span></font><font face="Webdings" color="#008000" size="5"><span style="</div><div>font-size:18pt">P</span></font><font face="Arial" color="#0000ff"</div><div>size="1"><span style=" font-size:8pt"> </span></font><</div><div>font face="Arial" color="#008000"><span style=" font-size:7pt">Consider</div><div>the environment. </span></font><font </div><div>face="Webdings" color="#008000" size="7"><span style="</div><div>font-size:36pt">?</span></font><font face="Garamond" color="#ff0000"</div><div>size="2"><span style=" font-size:10pt"> </span></font><font face="Verdana"</div><div>color="#ff0000" size="1"><span style=" font-size:8pt"><i</div><div>>Please don't print, unless you really need to.</i></span></font></p></div><div><p align="justify" style="margin-left:0mm; margin-right:0mm;</div><div>text-indent:0mm; margin-top:1.76mm; margin-bottom:1.76mm;"><font</div><div>face="Times New Roman"><span style=" font-size:12pt">This e-mail message</div><div>may contain proprietary, confidential or legally privile</div><div>ged </div><div>information for the sole use of the person or entity to whom this message</div><div>was </div><div>originally addressed. Any review, e-transmission dissemination or other</div><div>use of or </div><div>taking of any action in reliance upon this information by persons or</div><div>entities other than </div><div>the intended recipient is prohibited. If you have received this e-mail in</div><div>error kindly </div><div>delete this e-mail from your records. If it appears that this mail has</div><div>been forwarded to </div><div>you without proper authority, please notify us immediately at</div><div></span></font><a href="mailto:radhx@rediffmail.com"><font face="Times New</div><div>Roman" color="#3366ff"><span style="</div><div>font-size:12pt"><u>radhx@rediffmail.com</u></span></font></a><font</div><div>face="Times New</div><div> Roman"><span style=" font-size:12pt"> </div><div>and delete this mail. </span></font></p></div><div><div align="left"></div><div><hr size="1pt" width="100%" align="left"/></div><div></div></div><div></body></div><div></html></div><div> </div><div>--Alt-Boundary-29032.22664880--</div><div> </div><div>--Message-Boundary-17282--</div><div> </div><div>--Message-Boundary-1701</div><div>Content-type: text/plain; charset=US-ASCII</div><div>Content-disposition: inline</div><div>Content-description: Attachment information.</div><div> </div><div>The following section of this message contains a file attachment</div><div>prepared for transmission using the Internet MIME message format.</div><div>If you are using Pegasus Mail, or any other MIME-compliant system,</div><div>you should be able to save it or view it from within your mailer.</div><div>If you cannot, please ask your system administrator for assistance.</div><div> </div><div>   ---- File information -----------</div><div>     File:  cleanmem_v2.2.0_setup.exe.7z</div><div>     Date:  27 Jul 2011, 15:55</div><div>     Size:  2679111 bytes.</div><div>     Type:  Unknown</div><div> </div><div>--Message-Boundary-1701</div><div>Content-type: Application/Octet-stream;</div><div>name="cleanmem_v2.2.0_setup.exe.7z"; type=Unknown</div><div>Content-disposition: attachment; filename="cleanmem_v2.2.0_setup.exe.7z"</div><div>Content-transfer-encoding: BASE64</div><div>=========================================================</div><div>  </div><div> </div><div>Pegasus Mail Info:</div><div>==============</div><div>Pegasus Mail for Microsoft Windows</div><div>Copyright (C) 1992-2011, David Harris, all rights reserved</div><div>Electronic mail to support@pmail.gen.nz.</div><div> </div><div>WinPMail version: Version 4.61 (Win32), Feb  5 2011</div><div>Language resources: Standard UK English resource set</div><div>Extension Manager version: 1.13</div><div>Operating mode: Standalone</div><div>User name and ID: Admin, 0</div><div>Windows version: 5.1</div><div>Windows flag word: 0</div><div>WINPMAIL.EXE directory: D:\PMAIL\Programs</div><div>Home mailbox location: D:\PMAIL\MAIL\Admin</div><div>New mailbox location: D:\PMAIL\MAIL\Admin</div><div>TMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp</div><div>TEMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp</div><div>LAN-based SMTP support: N, N, N</div><div>NetWare MHS support: N, N, N</div><div>Built-in TCP/IP support: Enabled</div><div>  - WINSOCK version: WinSock 2.0</div><div>  - WINSOCK path: C:\WINDOWS\system32\WSOCK32.DLL</div><div>Commandline: -roam -A</div><div>Active -Z options: 32768</div><div>PMR variable: (None)</div><div>PML variable: (None)</div><div>MAI variable: (None)</div><div>NB variable: (None)</div><div>Autofiltering folders: 88 (88 active, 0 inactive)</div><div>Last new mail count: 3</div><div>================</div><div> </div><div>Mercury Info:</div><div>==========</div><div>Mercury/32 Mail Transport System for Microsoft Windows</div><div>Copyright (C) 1993-2011, David Harris, all rights reserved</div><div>Visit our web site, http://www.pmail.com for support info.</div><div> </div><div>Mercury/32 version: Mercury/32, v4.73, Mar 10 2011</div><div>Operating mode: Standalone</div><div>Windows version: 5.1</div><div>MERCURY.EXE directory: D:\MERCURY</div><div>Base directory: D:\MERCURY</div><div>New mailbox location: D:\PMAIL\MAIL\~N</div><div>TMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp</div><div>TEMP environment variable: C:\DOCUME~1\Rad\LOCALS~1\Temp</div><div> </div><div>License number: 0</div><div>License level: </div><div>==========</div><div> </div><div>Thanks & Regards,</div><div>Rad. </div><div> </div>

> My Setup is -  WinXP Pro SP2 + PMail 4.61 + Mercury 4.73 > > > Sending mails with attachments (usually doc, zip, 7z files) fails with > following trace: > ================================ > > SMTP Network and Protocol Sending Error: Connection timeout (no response from host) > > > Trace: > Connection established to 203.199.83.244 > >> 0036 220 webmail39.rediffmail.com ESMTP > << 0020 EHLO [192.168.0.1] > >> 0030 250-webmail39.rediffmail.com > >> 0016 250-PIPELINING > >> 0014 250 8BITMIME > << 0034 MAIL FROM:<radhx@rediffmail.com> > >> 0008 250 ok > << 0029 RCPT TO:<radhx99@gmail.com> > >> 0008 250 ok > << 0006 DATA > >> 0046 354 Start mail input; end with <CRLF>.<CRLF> > 8: Socket read timeout. > ================================ > > > But though sending fails and mail remains in the queue, in fact many > times (but not all) it has been sent properly as I can download it > from receiving account. > > > Tried sending attachments with varying sizes - <1MB, <2MB, <3MB etc. > but getting same result. The sending process (percentage display) > stops/hangs anywhere in-between 50% and 100%, never reaching 100%. > 1.    Increase the timeout in MercuryE (MercuryC) to 300 seconds. 2.    If step one did not fix the problem then I suspect a problem with fragmented packets.  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 disappear.

<div>Hi Thomas,</div><div> </div><div>I am using WinPMail/Mercury on Sony VAIO VGN-B66SP laptop with following config:</div><div>----</div><div>CPU 1.66GHz</div><div>RAM 1.2GB</div><div>NIC Intel(R)Pro/100VE</div><div>Chipset Intel i855GM/GME</div><div> </div><div>I am not using Mercury for sending my regular mail, but using it as smtp</div><div>server (gmail account) for forwarding all my yahoo mails to my main email</div><div>account using "EasyEmailForwarding" and "FreePOPs". My regular mails do not</div><div>appear in Mercury queue as compared to my forwarded yahoo mails.</div><div> </div><div>I tried increasing timeout in MercuryC to 300, but it had no effect.</div><div> </div><div>TCP Optimizer displayed blank value for MTU.</div><div>Following is the result of Largest MTU query:</div><div>----</div><div>Pinging [96.17.181.50] with 1500 bytes -> ..fragmented</div><div>Pinging [96.17.181.50] with 750 bytes ->bytes=750 time=1785ms TTL=54</div><div>Pinging [96.17.181.50] with 1125 bytes ->bytes=1125 time=1932ms TTL=54</div><div>Pinging [96.17.181.50] with 1312 bytes ->bytes=1312 time=2828ms TTL=54</div><div>Pinging [96.17.181.50] with 1406 bytes ->bytes=1406 time=2499ms TTL=54</div><div>Pinging [96.17.181.50] with 1453 bytes ->bytes=1453 time=2819ms TTL=54</div><div>Pinging [96.17.181.50] with 1476 bytes -> ..fragmented</div><div>Pinging [96.17.181.50] with 1464 bytes ->bytes=1464 time=3264ms TTL=54</div><div>Pinging [96.17.181.50] with 1470 bytes ->bytes=1470 time=2787ms TTL=54</div><div>Pinging [96.17.181.50] with 1473 bytes -> ..fragmented</div><div>Pinging [96.17.181.50] with 1471 bytes ->bytes=1471 time=2945ms TTL=54</div><div>Pinging [96.17.181.43] with 1472 bytes ->bytes=1472 time=3329ms TTL=54</div><div>The largest possible non-fragmented packet is 1472  (1500 - 28 ICMP & IP headers).</div><div>You can set your MTU to 1500</div><div> </div><div>I modified the MTU value to 1492 and tried sending the mail with attachment.</div><div>This time "SMTP: Sending Mail" percentage didn't move from 0% and sending</div><div>failed with following message:</div><div>----</div><div>[*] Connection established to 203.199.83.104</div><div>>> 0036 220 webmail38.rediffmail.com ESMTP</div><div><< 0020 EHLO [192.168.0.1]</div><div>>> 0030 250-webmail38.rediffmail.com</div><div>>> 0016 250-PIPELINING</div><div>>> 0014 250 8BITMIME</div><div><< 0034 MAIL FROM:<radhx@rediffmail.com></div><div>>> 0008 250 ok</div><div><< 0029 RCPT TO:<radhx99@gmail.com></div><div>>> 0033 250 Very nice address Sender ok</div><div><< 0006 DATA</div><div>>> 0061 354 SE answer: Enter mail, end with "." on a line by itself</div><div>8: Socket read timeout.</div><div> </div><div>I tried to disable MTU Discovery in TCP Optimzer, but after reboot it always</div><div>gets enabled somehow.</div><div> </div><div>I also tried disabling checksum offloading in TCP Optimizer but it too had no</div><div>effect.</div><div> </div><div>The previous WinPMail version 4.51 had no issues with attachments.</div><div> </div><div>Thanks & Regards,</div><div>Rad.</div><div> </div>