Merge branch 'maximaweb/ispconfig3-5918-custom-imap-prefix-by-mailbox' into...

Merge branch 'maximaweb/ispconfig3-5918-custom-imap-prefix-by-mailbox' into '5918-custom-imap-prefix-by-mailbox'

Mark imap_prefix as an is_admin only field

See merge request !1
1 job for !1605 with 5918-custom-imap-prefix-by-mailbox in 7 minutes and 20 seconds (queued for 11 seconds)
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