Debugging CiviMail and mail servers

[amazon]

1) Go check your CiviCRM > Global Settings > Outbound Email(SMTP)
Make sure the settings are correct.
2) Test sending a mail from a contact.  If you can send a mail then your SMTP settings are working.
3) If you settings are not working try telneting to your mail server.

You should be able to type: remote host # telnet localhostname.berkeley.edu 25

And see the following response

Trying xxx.xxx.xxx.xxx...
Connected to nature.berkeley.edu.
Escape character is '^]'.
220

Here's some more help: http://archives.neohapsis.com/archives/postfix/2007-04/0331.html

4) If you don't see 220 response from your remote mail server.  Find your error log files.  Read the last error in your mail server log file.

Hope that helps.

Kieran

[Piotr Szotkowski]

A quick comment: the telnet command should be issued from the same server CiviCRM is installed on. Quite often mailservers have different restrictions for connections from the same machine (i.e., localhost), from a common local network and from the rest of the world.