FortiMail
FortiMail provides advanced, multi-layer protection against the full spectrum of email-borne threats
pchee
Staff
Staff
Article Id 216219
Description This article describes methods to do when email went missing where dovecot server is running on top NAS storage. 
Scope FortiMail, NAS.
Solution

FortiMail is used with NAS storage configuration where dovecot server is running on top NAS storage || dovecot-uidlist.lock.

Email was stored externally.

 

Example of an issue experienced to load even from webmail.

 

mail_not_loading.jpg

 

Further checking on the Mail_Event_Log indicate below errors.

 

irfan_FTNT_0-1656926784830.png

 

 

During the IMAP write operation, if FortiMail experience connectivity issue with NFS, the dovecot-uidlist.lock status will remain hence retrieving mailbox will not be possible.

 

https://doc.dovecot.org/admin_manual/mailbox_formats/maildir/

https://doc.dovecot.org/developer_manual/design/indexes/mail_index_api/

 

Solution.

 

A reboot is require to clear the dovecot-uidlist.lock status.

It is advisable to drop down to an older version of the NFS to NFSv3 instead of using the latest NFSv4 for more stable connection with FortiMail.

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