Dovecot: mdbox and alternate storage support
http://forum.odin.com/threads/dovecot-mdbox-and-altmove-support-in-plesk.334620/
It would be really handy if we could, via Plesk panel or some cli utility, o switch from Maildir to mdbox as mailbox storage format and enable alternate storage for old emails. This way we can optimize the disk usage by using the fast storage media for recent emails, while the old stuff can go on a slower, cheaper media. Will also help a lot in growing our mail customer base without forking out ridiculous amounts of money for expensive fast disks arrays to keep up with the growth rate.
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Stipica Grgic commented
This would be really beneficial especially if that alternate storage would be MinIO/S3. Further more that recent e-mail are stored locally and older e-mails on this external storage and everything works seamlessly.
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Houssam Chergui commented
It is crucial to switch to MDbox instead of Maildir, we have to go on a trip to convert mailboxes before importing Cpanel accounts, what a pain!
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Lucas Rolff commented
We'd like to look into possibly offering Plesk as an option next to cPanel, however, we'd need mdbox to be supported, since we're working with customers who have enormous mailboxes (literally 100s of thousands of emails) - Maildir simply isn't effective when working with tons of emails.