SMTP Authentication

Hello everyone.

I am back with some more email security!

Today I’d like to talk about SMTP Authentication.
Some people may never have heard of this concept or may have simply ignored it as it seemingly may not feel that important.

However, in certain situations one may need to make use of SMTP Auth for email.

SMTP Authentication

SMTP Authentication - Outgoing Emails

SMTP Authentication – Outgoing Emails


As shown above in the diagram.

SMTP Auth is fairly simply to use for all incoming or outgoing emails.

Essentially, a machine has to authenticate with the central mail server.

The authentication can be done in various ways.

You can normally query LDAP, Active Directory, or some other identity management system as well as store the credentials on the mail server (not recommended).

How Does It Work?