Problem Description
- Someone is sending email using my email address or domain
- Someone is forging my email address as the sender
- Emails arrive that look like they come from me or an associate / employee, but are not
Problem Resolution
Email forgery is surprisingly common, as such there are now a few different types of techniques to protect against it: Sender Policy Framework (SPF), DKIM, and DMARC. For all of these types of forgery protection, the receiving server must support whichever of them you are using for it to be effective. This is why it's best to use all of them when you can, as some servers only support one or two of them.
Check out our comprehensive guide to mail authentication records to learn how to make this happen.