What Is Email Spoofing?
Email Spoofing
When the FROM line in an email header is changed from the email address it was sent from to another one, this is known as spoofing. A lot of Mailer Daemon/Failure Notification messages in your mailbox is a dead giveaway that this is what's going on. This shows that your email address was entered in the FROM header by the email spoofer.
How Is This Possible?
The return address field on email and snail mail can be filled with any address, which makes them similar. But you can lessen the likelihood of this happening!
What Can I Do?
The BEST ways to guard against spoofing are to set up DKIM correctly and build a Sender Policy Framework (SPF) Record.
Unverified users attempting to send messages from your domain will be blocked by the SPF record.
By adding a digital signature to your email address, Domain Keys Identified Mail (DKIM) enables recipient servers to verify that the message is authentic. Therefore, this also lessens the possibility that emails may be flagged as spam by the mail server of the receiver.
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