I have setup a posfix mailserver and some of the messages (sent from Microsoft exchange online) are rejected with below error.
SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds, which cannot be sent via DATA and receiving system does not support BDAT
I found a Miscrosoft forum that asked to enable ESMTP in receiveing server but I couldn't find a way of doing it. Or based on the above error is there a way to support BDAT in postfix servers?
The output of the
nc -C mx.xxxxxxx.com 25 <<<$'EHLO example.com\nQUIT\n'
220 localhost ESMTP Postfix 250-localhost 250-PIPELINING 250-SIZE 1024000000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN 221 2.0.0 Bye