We are installing a Debian Etch server with Postfix as the mail server. During the test all seams fine except sending emails to some servers. Sending to certain addresses it looks like the email has been sent but never arrives to the destination mailbox.
In the mail.log it sais : "...lnxsrv postfix/smtp: .......to=<email@example.com>, relay=targetdomain.com.au[...]:25, delay=31072, delays...,dns=4.4.2, status =deferred (lost connection with targetdomain.com.au[202....] while receiving the initial server greeting)
In the mx record the server is office.clientdomain.com.au while the actual hostname of the server is lnxsrv, fqdn is lnxsrv.clientdomain.com.au. I have tried it with mailname set to lnxsrv and also with setting it to office, neither seam to resolve the issue.
The client can send email to servers not hooked up with postini service, but not to the one using postini spam/AV filtering service.