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I have a mail server running on a Fedora 6 machine.
We are using Thunderbird as our client mail all the while. It is running well. But lately, we can't send mail out and there is error saying
"An error occured sending mail: The mail server sent an incorrect greeting: Cannot connect to SMTP server XX.XX.X.XX(XX.XX.XX.XX:25), connect error 10061"
I have no clue why suddenly I can't send mail from the thunderbird.
I have squirrelmail client which configure to use sendmail to send the email, it is working well. So, this means that my mail server is functioning well. Only that the thunderbird can't send mail.
You haven't been clear of what you run where, but given that error the first check I'd do is for client and serverside firewalling blocking access. If you can telnet from the client to the mailserver port 25 then it's not that.
If you can connect to the port (remote) and Squirrelmail works (local) then I doubts it's a Sendmail-related problem (check the logs to be certain it's not auth stuff). You said "lately, we can't send mail out". Does this mean you could before? Does the problem apply to all remote clients or some? Different e-mail clients? When did this start happening? Can you trace any configuration changes or updates back to that point in time?
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