I have a zimbra open source installation.
Emails sent to hotmail/live/aol email addresses have started to be bounced recently.
This is a sample log entry:
Oct 13 14:06:40 ENC4 postfix/smtp: 794A6C664F: lost connection with mx1.hotmail.com[220.127.116.11] while
Is this purely just a mailserver timeout issue or something more sinister?
The email bounces display this message which does suggest emails are being blocked purposely:
: host mx4.hotmail.com[18.104.22.168] said: 550
OU-002 Mail rejected by Windows Live Hotmail for policy reasons. Reasons
for rejection may be related to content with spam-like characteristics or
IP/domain reputation problems. If you are not an email/network admin please
contact your E-mail/Internet Service Provider for help. Email/network
admins, please visit MSN Postmaster for email delivery
information and support (in reply to MAIL FROM command)
Any help would be appreciated.