Hello,
action "tanoutbound" relay host smtp://mail.airstreamcomm.net auth <ratable>
action "axreiosoutbound" relay host smtp://mail.airstreamcomm.net auth <ratable>
As far as I am aware, this would attempt relay over port 25, and without
TLS, which is usually not used for authenticated SMTP. Do you know what
port your ISP's MTA is using for authenticated SMTP? Usually it would be
465 for implicit TLS or 587 for STARTTLS.
I think you should also include the aliases table key in the host value.
Here is a possible example line for implicit TLS:
'''
action "tanoutbound" relay host smtps://t...@mail.airstreamcomm.net:465
auth <ratable>
'''
Also, if you actually ran the previous configuration live you may want
to consisder rotating credentials. If TLS was not used an on-path
attacker might have read your credentials in the plain.
- Otto