pambase 20190105.1-1 caused bad failure for email.
The error I saw immediately was from postfix failing to authenticate
users via saslauthd which in turn blames pam. Downgrading back to
20171006-1 restores email funtioning ok.
Logs say:
saslauthd[22214]: pam_warn(smtp:auth): function=[pam_sm_authenticate]
flags=0x8000 service=[smtp] terminal=[<unknown>] user=[lists]
ruser=[<unknown>] rhost=[<unknown>]
saslauthd[22214]: DEBUG: auth_pam: pam_authenticate failed:
Authentication failure
saslauthd[22214]: do_auth : auth failure: [user=lists]
[service=smtp] [realm=] [mech=pam] [reason=PAM auth error]
