My subscribers are getting a message about temporary delivery problems at their ISP
What does this message mean at the top of a message to the mailing list ?
Our mailing list system had problems delivering previous message(s) to this subscriber. Most likely due to a previous message being considered Spam.
After two bounce messages from their ISP, we start to throttle deliveries, so the subscriber is not removed from the list for too many bounce messages.
When that happens, the above message is inserted as a courtesy, to let them know about the missing messages.
If they want to read the messages that their ISP blocked, they can go to the http://missing.mail-list.com web site listed in the email.
That web page contains all the messages send for the past 2 weeks.
They will need to log in with the Username and Password provided.
How long will this message appear on my subscriber's emails ?
Until we are sure that the problem at the ISP is resolved.
Because of the bounce messages, we randomly skip some deliveries until we no longer receive bounce messages. The random percentage to skip increases as more bounces are returned.
When we put this message into their email, we do not know if they will get that particular message or not. That message may also get bounced back.
Once we are sure that the messages are being successfully delivered, that message is no longer inserted.
Some bounces from ISP's happen immediately and others take up to three days. Therefore, this message can appear for as long as 3.1 days, if there is not a lot of traffic to your mailing list.