Symptoms
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Failed to protect domain in SpamExperts extension for Plesk, the following error appears
Unable to add to SpamExperts: Failed to add the domain 'example.com' into the spamfilter
Cause
Issue is on SpamExperts side: The error indicates that the domain belongs to a different account on SpamExpert side. It may happen if the domain was protected with SpamExpert in past (with different SpamExpert license, for example) and the domain is still linked to another account (old one) on SpamExpert side.
Resolution
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Go to Domains > example.com > DNS Settings
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Remove all MX records which are pointing to
*.spamexperts.*
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Add new MX record
mail.example.com
for the domain in Domains > example.com > DNS settings > Add Record -
Protect domain again by selecting domain example.com in Extensions > My Extensions > SpamExperts Email Security > Domains and click Protect
Note: If solution above does not help, contact SpamExperts support for assistance using the form in the extension: Extensions > SpamExpert Email Security > Support