• If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread:
    CentOS2Alma discussion

AtMail + Horde + Othermail

You can define only one webmail in Service Plan. Thus your subscription, based on this Service Plan will allow to use only defined webmail. You can create separate subscription for each webmail subdomain based on different Service Plans as possible workaround.
 
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