What's the difference between Sent and Sent Messages

[TomHsiung]

I noticed that, all emails sent via my Macintosh Mail.app are under the Sent Messages folder. On the other hand, the emails sent via webmail page are under the Sent folder.

What's the difference?

Tom

[JohnDoh]

The difference is your settings in Mail.app and Roundcube about where to save your sent messages. In Roundcube you can manage these settings from the Settings screen, Preferences > Special folders

[TomHsiung]

Who created the Sent folder and who else created the Sent Messages folder?

Tom

[JohnDoh]

With default config Roundcube will create the Sent folder if it does not already exist when you send a message, see https://github.com/roundcube/roundcubemail/blob/release-1.3/config/defaults.inc.php#L706. Sent Messages I don't know, that could have been created by Mail.app or may be its a default folder on your IMAP server?

BTW you can use the Special Use extension (eg https://wiki.dovecot.org/MailboxSettings) on your IMAP server to have the server tell the client what the special folders are, Roundcube respects this and I assume Mail.app would too.