Incorrect sent folder

[dimyy]

Espo: 8.2.4
DB : MariaDB 10.5.23

Steps:
Group mail account
Protocol: IMAP
Select "save sent mail" in group account.
Sent folder name is cyrrilic ('Отправленные')
Mail don't saved into 'Отправленные'

https://github.com/espocrm/espocrm/blob/2fabf4bfe120c6048bca42e9623c17700d8724f3/application/Espo/Core/Mail/Account/Storage/LaminasStorage.php#L128

missing reverse encoding to 'UTF7-IMAP'
$this->imap->appendMessage($content, mb_convert_encoding($folder, 'UTF7-IMAP', 'UTF-8'));

If modify all ok

[yuri]

I'm not sure whether this will work for all IMAP servers.

From Wikipedia:

A modified form of UTF-7 (sometimes dubbed 'mUTF-7'[5]) was used in the Internet Message Access Protocol (IMAP) e-mail retrieval protocol, version 4 rev 1, for "international" mailbox names.[6] The following version, IMAP version 4 rev 2, uses UTF-8 instead.[7]

If anyone has more expertise on the matter, please let me know.

[yuri]

Anyway, if we do it for fetched emails, I hope it will also work for the sent folder. Thanks for suggested fix.

https://github.com/espocrm/espocrm/commit/5f70d1b408c5777ed92e90ac5cad0202794fd849