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Glossary Web & HTTP

Email address

An email address has a local part, an at sign and a domain, such as `[email protected]`, and identifies a mailbox.

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In more detail

The local part can be up to 64 characters and the whole address up to 254. A format check catches typos such as a missing @ but cannot prove the mailbox exists; only sending a message and having the owner confirm it does.

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Email Format Validator

Validate an email address's syntax and get a clear explanation of exactly why it's invalid if it fails.

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Fill in your name, role and contact details, pick a style and colour, and copy a table-based HTML signature that works in Gmail, Outlook.

See also

  • Glossary DKIM
    DKIM (DomainKeys Identified Mail) adds a digital signature to outgoing email that receivers verify with a public key published in DNS.
  • Glossary SPF
    SPF (Sender Policy Framework) is a DNS record listing which servers may send email for a domain.
  • Glossary DMARC
    DMARC is a DNS policy that tells receivers what to do with email that fails SPF and DKIM alignment, and where to send reports about it.
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