[quote user="Thomas R. Stephenson"]>

I assume that you are saying that this IP address of the sending system has been blocked by the ISP for sending spam.
[/quote] 

Correct, at least i think so....
[quote user="Thomas R. Stephenson"]>

We really need to see this one and there is nothing at all insecure about posting the sending systems IP address.  It's in the header of every message you send from the system.
[/quote]  

OK, makes sence. It's 31.151.231.99

[quote user="Thomas R. Stephenson"]>
1.    You need to check the IP address to ensure it's not on any black list. 
[/quote]    
Don't think its blacklisted. Just blocked by ISP for sending spam (I think)
[quote user="Thomas R. Stephenson"]>
2.    You need to check the error messages when sending, probably best done via MercuryC session logging. 

3.    Provide a copy of the Mercury.ini file so we can help analyze the problem. 
[/quote]   
Both sent to you by email.

THNX Thomas! 

PS: My mail sent to you is via my own server, not via my dad's! 

Hello,

I am monitoring my dad's server with the following problem:

In setting of MercuryS SMTP Server the "Only Authenticated SMTP connections may relay mail"-box is checked. We have a pw.txt file there with a username and password.

Now his IP is blocked (by ISP) for sending messages.

In the MercuryS logfile i found the following (one of many and shortened):

T 20120426 143531 4f88a719 EHLO 

31.151.***.** 

T 20120426 143531 4f88a719 AUTH CRAM-MD5

T 20120426 143531 4f88a719 MAIL FROM:<officefile888@gmail.com>

T 20120426 143531 4f88a719 RCPT TO:<yontzy@hushmail.com>

T 20120426 143531 4f88a719 RCPT TO:<yoshirc@cox.net>

T 20120426 143531 4f88a719 RCPT TO:<youneedtocalljane@gmail.com>

T 20120426 143531 4f88a719 RCPT TO:<younger_ron7@yahoo.com>

T 20120426 143531 4f88a719 RCPT TO:<youngladyred@yahoo.com>
etc....etc....

The above mentioned "connection from 31.151.***.**" is my dad's IP-addres.

In what direction do I need to look for the problem?

Hope anyone can help me.

THNX in advance, Marcel. 

> I am monioring my dad's server with the following problem:
>
> In setting of MercuryS SMTP Server the "Only Authenticated SMTP
> connections may relay mail"-box is checked. We have a pw.txt file
> there with a username and password.
>
> Now his IP is blocked (by ISP) for sending messages.

I assume that you are saying that this IP address of the sending system has been blocked by the ISP for sending spam.

> In the MercuryS logfile i found the following (one of many and shortened):
>
> T 20120426 143531 4f88a719 Connection from 31.151.***.**

We really need to see this one and there is nothing at all insecure about posting the sending systems IP address.  It's in the header of every message you send from the system.

> T 20120426 143531 4f88a719 EHLO  31.151.***.**
> T 20120426 143531 4f88a719 AUTH CRAM-MD5
> T 20120426 143531 4f88a719 MAIL FROM:<officefile888@gmail.com>
> T 20120426 143531 4f88a719 RCPT TO:<yontzy@hushmail.com>
> T 20120426 143531 4f88a719 RCPT TO:<yoshirc@cox.net>
> T 20120426 143531 4f88a719 RCPT TO:<youneedtocalljane@gmail.com>
> T 20120426 143531 4f88a719 RCPT TO:<younger_ron7@yahoo.com>
> T 20120426 143531 4f88a719 RCPT TO:<youngladyred@yahoo.com>
> etc....etc....
>
>
> The above mentioned "connection from 31.151.***.**" is my dad's IP-addres.
> In what direction do I need to look for the problem?

1.    You need to check the IP address to ensure it's not on any black list.

2.    You need to check the error messages when sending, probably best done via MercuryC session logging.

3.    Provide a copy of the Mercury.ini file so we can help analyze the problem.

> Hope anyone can help me

Not without more specific data, especially that provided by a session log.  If you post a MercuryC session log make sure you munge the encrypted strings to send if you are using LOGIN or PLAIN SMTP authentication.  

I can help you analyze this if you do not want to post it here by sending this to the support address shown in my signature.