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Mail stays in the delivery queue or gets bounced back

If your own mailserver is configured correctly and has no known issues (like a full disk, cpu overload), but still email does not arrive and is instead waiting in the delivery queue or bounced back to the sender then the cause is usually one of the following;

  • There is an issue on your own mailserver after all. Unfortunately it happens often that people are not aware of problems going on on their mailserver. Doublecheck this with your systems manager.
  • Your server is filtering the email that SpamExperts is sending you. This results in your server checking blacklists or misjudging the headers that SpamExperts added.

If you use the SpamExperts-platform, make sure that the final receiving mailserver does not have spam-filtering turned on, to avoid the chance of blocking the spam-cluster itself. If it is really necessary to turn on spamfiltering, even though the spam-filtering is already before, please make sure the folowing IP's are whitelisted in your firewall:

79.99.129.0/24
188.40.127.0/24

If your server is not filtering the email coming from the SpamExperts platform, please contact our support department.

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