Add ldap to store Plek users credentials so a spam filter can verify the Plesk users without making an SMTP connection.
Could you add a local LDAP server to Plesk to verify Plesk email users?
We currently use a spam filter (Barracuda). It has the ability to verify the recipient via LDAP. https://campus.barracuda.com/product/essentials/knowledgebase/50160000000IUSGAA4
/How+can+I+configure+recipient+verification+for+Barracuda+Email+Security+Service+-ESS-/
This would be handy.
1
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IG