How email verification works, without sending an email
The steps a verifier takes, the conversation it has with a mail server, and what it honestly cannot know.
Read the guideWhat is a catch-all email address?
Why some mail servers accept every address, how that is detected, and whether those addresses are safe to send to.
Read the guideWhy do emails bounce? Hard and soft bounces explained
Hard bounces, soft bounces, the reply codes behind them, and what each one means for the address.
Read the guideHow to clean an email list before you send
Seven steps from a messy export to a list you can send to, and how to keep it that way.
Read the guideWhat is a disposable email address?
Temporary mailboxes: what they are, why they end up on your list, and how they are recognized.
Read the guide