Problem with change file format in maildir

[turix13 at gmail.com]

hi, i have a problem with a dovecot 2.2.36 (1f10bfa63) server, using maildir,
some mails change the file format, the flag is modified and they appear
again in the inbox as unread. 

ex.
1548753605.56008.server-mail,S=5935:2 (origin)
1548~RZ!.ESS:2 (modified)

Could someone give me some light? thx. 

br. 



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