--On Monday, January 13, 2025 6:31 PM -0500 Scott K via Postfix-users
<postfix-users@postfix.org> wrote:
The last of these problems doesn't show in the log just Thunderbird
says it couldn't connect to the relay server and I should check to make
sure my email address is correct
If you're just starting to learn how to manage a mail server, Thunderbird
is the wrong tool to test. It's too high-level. Instead, use telnet and
learn enough of the SMTP and IMAP protocols that you can type simple
commands to each service. The logout commands for each are a good simple
connectivity test. If those don't work, Thunderbird has no hope of working,
and they're a quick and easy way to get the basics going. (I actually start
with a simple ping test to make sure DNS and TCP are working. Then I move
up to SMTP and IMAP using telnet.)
Once the basics are functional, if Thunderbird is throwing errors, you
could use Wireshark to monitor the raw packets and see what's failing. This
assumes you're not using SSL yet. Do all this on a private network so you
don't have to worry about outsiders snooping on your passwords on a
cleartext connection. Once you add SSL, you'll want to learn how to use
openssl to test that and send low-level SMTP and IMAP commands over an
encrypted link.
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