This has just started happening to me this morning. I am authenticating and I'm using port 587 (which fixed this problem last time).
Jun 8 11:07:31 hostname postfix/smtp[1342128]: xsasl_cyrus_client_next: decoded challenge: Username:
Jun 8 11:07:31 hostname postfix/smtp[1342128]: xsasl_cyrus_client_get_user: xxxxxxxx@tpg.com.au
Jun 8 11:07:31 hostname postfix/smtp[1342128]: xsasl_cyrus_client_next: uncoded client response xxxxxxxxx@tpg.com.au
Jun 8 11:07:31 hostname postfix/smtp[1342128]: > mail.tpg.com.au[27.32.32.11]:587: aHliaWVwb29AdHBnLmNvbS5hdQ==
Jun 8 11:07:31 hostname postfix/smtp[1342128]: < mail.tpg.com.au[27.32.32.11]:587: 334 UGFzc3dvcmQ6
Jun 8 11:07:31 hostname postfix/smtp[1342128]: xsasl_cyrus_client_next: decoded challenge: Password:
Jun 8 11:07:31 hostname postfix/smtp[1342128]: xsasl_cyrus_client_get_passwd: xxxxxxxxxxxxx
Jun 8 11:07:31 hostname postfix/smtp[1342128]: xsasl_cyrus_client_next: uncoded client response xxxxxxxxxxxxx
Jun 8 11:07:31 sarkmekawk postfix/smtp[1342128]: > mail.tpg.com.au[27.32.32.11]:587: ZE4zNlpVNE1XVU91Qk9C
Jun 8 11:07:31 sarkmekawk postfix/smtp[1342128]: < mail.tpg.com.au[27.32.32.11]:587: 235 2.0.0 OK Authenticated
I have tried in the past to email postmaster about this problem and received no reply.
Edit: I've also tried sending directly to TPG servers through my email client and received the same message. Please fix your mail servers.
