Hope I can ask this clearly. I have 5 email accounts in play.
is a new one set up with ISPConfig3 on a server in a data center.
is an existing one with a shared hosting provider.
is an existing one set up with ISPConfig3 on a home server and relaying though B@B.com
's mail server.
is a webmail account with Yahoo.
is a Microsoft Exchange Server at the day job.
is the issue. It can receive emails from all of the others. But if it sends an email to the other 4, it arrives fine at D@D.com
but never arrives at B@B.com
. The postfix log says all passed clean with no errors. There is never a return message saying that there was a problem anywhere. They just vanish. I'm thinking the shared hosting provider is somehow blocking these but now sure how or why. The IP and host name for A@A.com
don't appear on any blacklists. Anyone have a clue of what else to check out? Thanks.