Mail problems after upgrade

[kilburn]

Code:

...
mech_list: sql plain login
...

mech_list specifies the user/password transmission mechanisms available, not the checking methods. "sql" is NOT a valid mechanism, so you should remove it from here.

Code:

...
smtpd_sasl_security_options = noanonymous, noplaintext
...

You MUST use plain text passwords with the current SASL setup (Postfix docs on SASL), so this should be:

Code:

...
smtpd_sasl_security_options = noanonymous
...

Try changing those things and tell us if it works