Sorry for such a noob question, but I'm not understanding the docs.
I can send mail from the web interface, but I can't figure out how to configure either Thunderbird or Mac Mail to send e-mail through Zimbra. (We don't use Windows for e-mail.)
The global settings under "MTA" have:
[X] enable authentication
[X] TLS authentication only
For example, on Thunderbird, regardless of the permutations I try for outgoing SMTP server settings, I see the following when I try to send mail:
Mail Server Password Required
Enter your password for email@example.com on mail.mydomain.com
After several attempts it fails with
Send Message Error
Sending of message failed.
The message could not be sent because connecting to SMTP server mail.mydomain.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your SMPT server setting is correct and try again, or else contact your network administrator.
I just checked to ensure that port 465 is open in the firewall.
/opt/zimbra/postfix/conf/master.cf has the following uncommented:
465 inet n - n - - smtpd
-o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes