[12.0][13.0] mail_to: port from 11

[yelizariev]

• 32ba6a0 - new feature
• https://github.com/Ommo73/mail-addons/pull/2/files - some fixes, but without explanation. With porting, one must provide an explanation why it's still needed or why it's not needed anymore

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[trojikman]

Current state:

• 32ba6a0 is merged to 12.0