Install vrfydmn by entering the following commands in the terminal:
sudo apt update sudo apt install vrfydmn
Description:
Milter for ensuring email message from matches mail from
This milter is used with postfix or sendmail to either reject mail from/body from mismatches or to fix up the body from to match mail from. This is intended for applications where local constraints on domains in use are required for sending mail.
Homepage: https://github.com/croessner/vrfydmn
Version: 0.9.1-1
Section: universe/mail