Symptoms
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Unable to set auto-reply in Plesk > Domains > example.com > Email addresses > john.doe@example.com > Auto-Reply with specifying the james.adams@example.com mailbox in the Forward to field due to the following error:
Mail cycling is detected, the address "john.doe@example.com" is contained in the mail group of this mail account.
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The Switch on mail forwarding option was turned off earlier in Plesk > Domains > example.com > Email addresses > james.adams@example.com > Forwarding.
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The Forward incoming messages to the following email address field contains the
john.doe@example.com
mailbox.
Cause
This is Plesk bug PPPM-3844.
Resolution
As a workaround, perform the following actions:
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Go to Plesk > Domains > example.com > Email addresses > john.doe@example.com > Forwarding or Plesk > Domains > example.com > Email addresses > john.doe@example.com > Auto-reply > Forward to
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Mark the Switch on mail forwarding checkbox and specify any non-existing mailbox, e.g. a@a.a, in the Switch on mail forwarding field.
Note: just removing the john.doe@example.com mailbox from the Forward incoming messages to the following email address field will not help to resolve the issue because this field cannot be empty.
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Unmark the Switch on mail forwarding checkbox again and press the OK button.
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Go to Plesk > Domains > example.com > Email addresses > john.doe@example.com > Auto-Reply and enable auto-reply with specifying the
james.adams@example.com
mailbox in the Forward to field.