I have set up a mail server using the well-known flurdy guide. I installed the mail server on my dedicated ubuntu server 9.04 which also runs my web sites. After lots of issues I have gotten the mail server to work so that email accounts can receive email; I have checked this using outlook and squirrelmail.
Now, while i can SEND email through squirrelmail, I cannot get email clients (outlook, iphone, etc) to do the same. So they can connect to the mail server and receive new email but nothing goes out.
Because squirrelmail is able to send email on the server, I suspect there is a issue related to firewall, ports, encryption, etc, but i honestly don't know where to begin troubleshooting. I can, however, tell that my hosting provider has the following firewall settings:
- IMAP (TCP 143)
- POP3 (TCP 110)
- SMTP (TCP 25)
- SUBMISSION (TCP 587)
- SSMTP (TCP 465)
Anyone out there who has followed flurdy's guide and knows what the issue can be?