Mail. Mailboxes transfer

From YANDEX

• use imapsync: Imapsync. Mailboxes transfer

From MAIL.RU

• it's necessary to add App Password and to use this App Password as Login/AppPassword (in order to do it you have to bind your mobile number to mail.ru account)
• use imapsync: Imapsync. Mailboxes transfer

From GOOGLE

Var 1. Imapsync

• it's necessary to add 2FA (via Mobile Number) and App Password (in the 2FA Section after adding 2FA) and to use this App Password as GMAIL-Login / AppPassword
• use imapsync

Var 2. Via MBOX export file format

• Login to gmail
• Follow the link: https://takeout.google.com/settings/takeout
• Choose Select data to include
• Unselect: ALL
• Select: Почта. Электронные письма и прикрепленные файлы из вашего аккаунта Gmail в формате MBOX. Пользовательские настройки из аккаунта Gmail в формате JSON.
• Next
• Follow the instructions. You'll get archive to youe mail, download file, unpack it, there'll be *.mbox
• Import *.mbox to your new mailbox