Email - Authentication

1 - About

The core email protocols do not have any mechanism for authentication.

3 - Gmail

Messages must be authenticated to make sure that they're classified correctly. Also, unauthenticated messages are very likely to be rejected. Because spammers can also authenticate emails, authentication by itself isn't enough to guarantee that your messages can be delivered.

Tips for sending bulk messages with Gmail:

4 - Fix messages that aren't authenticated

First, make sure that messages that you've sent are authenticated using

Use RSA keys that are at least 1024 bits long. Emails signed with less than 1024-bit keys are considered unsigned and can easily be spoofed.

5 - How to

6 - Documentation / Reference

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