In servers where "Enforce mailbox quotas" is enabled under IMAP settings, MailEnable is miscalculating the size of messages uploaded through IMAP APPEND.
For example, I tried to upload a 4MB message, but MailEnable logged it as a 4GB message:
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04/14/21 15:10:58 Message of size 4076767Kb for mailbox (test) on postoffice (example.com) would exceed mailbox quota of 51200Kb (current size 5Kb).