#how-to
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addy.io Guide: Addy Mail Aliases, Limits & Setup
addy.io is the email-alias service also called Addy Mail and formerly AnonAddy. Learn its alias types, limits, replies, PGP, domains, and setup.
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How to Set Up Email Aliases With SimpleLogin or addy.io
A setup guide for email aliases with SimpleLogin or addy.io: creating addresses, replying through an alias, custom domains, and a per-signup workflow.
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How to Read Email Headers: A Field Guide to the Envelope
A practical walkthrough of Received, SPF, DKIM, DMARC, and Message-ID headers so you can trace a message's real path and spot a spoofed sender quickly.