Bounce emails - unknown problem

ℹ️ Support
1

Hello, during the last shipments of my campaigns, I have been receiving a large percentage of emails such as the following:

"This is an automatically generated Delivery Status Notification.

Unable to deliver the message to the following recipients, due to being unable to connect successfully to the destination mail server. "

Has anyone had the same problem? Do you have any idea about this problem?

2

These types of messages occur when…

  1. the destination email server (and it’s backup server) are offline
  2. the destination server ‘blocks’ connections from your outgoing server… i.e. when you send too many messages too quickly, you are on a blacklist that it checks, etc.
  3. your sending server is out of date (for instance, last updated years ago).