Mails rejected from legit senders - SBC subscribers.

[Webcart]

Hello,

We recently transferred one of our support domains to DA-powered server running FreeBSD 4.10 and got a number of complaints from users who couldn't send us e-mails.
We do not have ANY mail filterting on that server as we are using 3rd party anti-SPAM solution.

spamd is not running on that server and we didn't make any changes to default mail configuration.

Here is a snapshot from /var/log/exim/exim_rejectlog file:

2005-03-24 09:17:57 H=smtp817.mail.sc5.yahoo.com [66.163.170.3] sender verify fail for [i]<[email protected]>[/i]:
2005-03-24 09:17:57 H=smtp817.mail.sc5.yahoo.com [66.163.170.3] F=<[email protected]> rejected RCPT <[email protected]>: Sender verify failed

somedomain.com is a valid domain which is hosted with us on a different server, [email protected] is a valid e-mail address, which I can reply to. This client uses his ISP SMTP server to send mails, though, as you can see in the logs.

DA version is 1.23.1.

Please advise - thank you.

 

[nobaloney]

Is the rejected sender trying to send email to an address on your server?

Your server is simply stating that when it checks to see if the sender is a valid sender, it cannot verify that so it doesn't accept the email.

This is required under RFCs because any server (including yours) that accepts email must be able to deliver it or to return it. Because it's not sure it can accept the email (for lots of reasons) it must not accept it if it can't send it back.

So the problem is in trying to find out why the server can't send email back to the sender.

I understand your reticence in not wanting to post the information here, but it's the only way any of us here can do the testing required to help you figure out the problem.

So I'd suggest trying to send an email to the sender using telnet to emulate exim, and see what kind of problems you run into.

Jeff

 

[Webcart]

Re: Re: Mails rejected from legit senders - SBC subscribers.

Is the rejected sender trying to send email to an address on your server?

Yes.

So the problem is in trying to find out why the server can't send email back to the sender.

Once I realized that, I tried to send e-mail to a sender from that server using

mail [email][email protected][/email]

and got a bounce mail.

Figuring out the rest was easy: we use that server to store backups of accounts from other servers and occasionally restore random users to verify backups integrity. Apparently, this client's domain wasn't deleted and remained active on that server, making the server "think" mails to @somedomain.com should be routed locally. Naturally, newly created e-mail accounts for this domain were rejected on the server with a backed up copy of the site.

I appreciate your help in troubleshooting this problem - thank you.