we recently started having some issues where it appeared that our mail server was suddenly blacklisted several days ago incorrectly - there was no spam being geenerated so we remvoed the servers a couple of days ago from the blacklists but we still get a lot of domains which are generating delays
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
email@example.com (domain removed)
this is with several companies too and some are still just flat refusing - this error message
smtp;554 Transaction Failed Spam Message not queued
seems common in the failed ones too -
our setup is that all mail routes direct over the internet and has been doiung fine with the current setuup for several months this only happened 1 week ago and was to pretty much everyonme till we removed ourselves from all the blacklists