A couple of days ago, we noticed that mails sent from a certain isp (@telenet.be) got rejected.
After turning off the content filtering the mails are being recieved but marked as spam.
I turned on smtp logging and tested mails from that isp (telenet.be) and my own (@techne.be) and they are both recieved the same way (see code, extract from smtplog)
When i telnet to the mailserver, i get a message (see screenshot) using the telenet account, but when i use the techne account i get the same message.
Thanks in advance
MAIL FROM:<email@example.com> SIZE=783,
,>,250 2.1.0 Sender OK,
,<,RCPT TO:<firstname.lastname@example.org> ORCPT=rfc822;email@example.com,
,>,250 2.1.5 Recipient OK,
,>,354 Start mail input; end with <CRLF>.<CRLF>,
,>,250 2.6.0 <W42457382743431247142470@nocme1bl6.telenet-ops.be> Queued mail for delivery,
,>,221 2.0.0 Service closing transmission channel,