I am having trouble sending messages to some of our customers who have bigpond accounts
I am aware of at least 5 accounts at bigpond that we regularly have a problem with.
Below is a sample from the server log.
SMTPClient: MAIL FROM:<email@example.com> SIZE=14348
SMTPClient: RCPT TO:<firstname.lastname@example.org>
SMTPClient: End of pipelined commands
SMTPClient: ReceiveResponse: 250 Sender <email@example.com> and extensions (SIZE=14358) Ok
SMTPClient: ReceiveResponse: 250 Recipient <firstname.lastname@example.org> Ok
SMTPClient: ReceiveResponse: 354 Ok Send data ending with <CRLF>.<CRLF>
SMTPClient: Data Send Succeeded 12217 bytes
SMTPClient: ReceiveResponse: 421 Message rejected
SMTPClient: Attempting to Disconnect:
SMTPClient: Connection terminated with status: 2562
Router: No messages transferred to BIGPOND.NET.AU (host extmail.bpbb.bigpond.com) via SMTP
The message retries a number of times and just occasionally will get through, but mostly will go back to the sender as rejected.
I tried calling Bigpond, but as my account is not with them (only the receiving user) they would not help me.
Any suggestions on how to fix would be appreciated.