Topic: Email error.. Failed sending the mail. SMTP Error: Data not accepted.

[Cottontail]

I experienced a power outage where my server took a hit. After which I have lost email sending and recieving ability. An observation of htop against a functioning instance of the same version (7.3) SME showed no obvious difference. pop3, smtp-auth-proxy, qmail, imaps, qpsmtpd, pop3s, and imap are all currently sleeping but on the ready ( i believe) Upon attempting to send an email, I get the message
Failed sending the mail. SMTP Error: Data not accepted.
This same message appears within all my clients; Horde,Groupoffice, and egroupware. What could be the cause of this and to where should I look to better observe this issue?
Thanks in advance..

[robin_wangaz]

Did you solve this?

[Cottontail]

Not as of yet. any assistance would be great!!

[robin_wangaz]

hey there
my problem was my ISP blocked port 25. After testing ie. scan ports (grc.com), commandline etc and running out of options i decided to contact my ISP and low & behold they had blocked port 25!

In your case it would be a good idea to check your logs (/var/log/qmail, /var/log/qpsmtpd) to pinpoint the problem. There are numerous posts on contribs pertaining to mail troubleshooting....sorry i couldn't be of more help. Good Luck!