hello Guys ,
we have received alot of complains that some employees are configuring fake emails on their mobiles , for ex : he type CEO@domain.com .. then in the user feild .. he type his username so the authentication will work on the server .. so once he sends an email it appears from ceo@domain.com but actually it's from his email ( john.ex@domain.com)
in other words , i tested the smtp server using https://www.wormly.com/test_smtp_server
and i was able to send fake emails to any one in our domain .
any way to block this or strict the username with his alias only not any fake alias ?
please ?