Webmail is not working on Plesk server: Error when communicating with the server

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    Gerasimos Perentidis

    I have the same issue with plesk 17.8.11.

    I have the Comodo rules. I added the custom settings but it did not solve the issue.

    Only when I DE-activated the CWAF rule/tag, was I able to send messages via webmail.

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    Nikita Nikushkin

    Hi @Gerasimos Perentidis!

    Indeed, the provided resolution was for the OWASP ModSecurity rule set, while you found for the Comodo one. Thus, the solution differs

    I added your information to the article in order to make it helpful for users who have the Comodo ModSecurity rule set

    Thank you!

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    Antrax1

    Hi,

    I have this problem only in IMAP email accounts and OWASP rules,  try this solutions but don´t work.

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    Ivan Postnikov

    Hello Antrax1,

    You seem to have another issue.

    Submit a request to Plesk Support, as a deeper investigation is required, here's the instruction: https://support.plesk.com/hc/en-us/articles/213608509-How-to-submit-a-request-to-Plesk-support-

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