In the functionality of mail clients, it is possible to specify a completely different mailbox as a sender, which is configured using profiles. For example, this feature allows you to enter the mailbox
email@example.com send letters specifying the sender
firstname.lastname@example.org... The recipient of the email will see the sender as
email@example.com. (Information regarding the real sender can be found in the technical headers of the letter).
This feature is convenient for using multiple mailboxes by one person, but it can be dangerous when using corporate mail. To disable the ability to substitute a different mailbox, do the following: