Postmaster (computing)

In electronic mail, a postmaster is the administrator of a mail server. Nearly every domain should have an e-mail address like postmaster@example.com where errors in e-mail processing are directed. Error e-mails automatically generated by mail servers' MTAs usually appear to have been sent from the postmaster address.

Every domain that supports the SMTP protocol for electronic mail is required by RFC 5321 and, as early as 1982, by RFC 822. Due to how common this address is across mail servers, it is a common target for spam.

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