I run a web server based on Ubuntu 12.04. I have installed and configured Postfix + Courier. I can receive my emails sent from other domains, but I can't manage to make SMTP works.
When I try to send an email via my server using Thunderbird (port 587, SASL), it asks for my password (only the first time), and then I get the most interesting error message of all time :
When I look at my mail.log, I only see this :The message could not be sent using SMTP server mail.mydomain.com for an unknown reason
Any idea why it doesn't work ?Jan 24 02:50:23 user postfix/smtpd: connect from CPE002401cd0a51-CM0014e8b60462.cpe.net.cable.rogers.com[22.214.171.124]
Jan 24 02:50:27 user postfix/smtpd: disconnect from CPE002401cd0a51-CM0014e8b60462.cpe.net.cable.rogers.com[126.96.36.199]
Port 587 is open in ufw.
If you can help me, thank you !
Btw, I found this in my syslog :
Don't know if it's helpful !Jan 24 02:50:23 user named: client 127.0.0.1#33804: query (cache) 'CPE002401cd0a51-CM0014e8b60462.cpe.net.cable.rogers.com/A/IN' denied
Jan 24 02:50:23 user named: client 127.0.0.1#60301: query (cache) 'CPE002401cd0a51-CM0014e8b60462.cpe.net.cable.rogers.com/A/IN' denied