MailSite Fusion - Knowledge Base

MailSite Fusion is a mail server, calendar server and contact server that works with Outlook 2007, iPhone, Windows Mobile and BlackBerry smartphones and provides a low cost alternative to Microsoft Exchange Server

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What is Mail Relaying?

Document #:10037

Applies To:

MailSite All

Synopsis:

General overview of mail relaying.

More Information:

Third-party mail relaying occurs when a mail server processes a mail message for which neither the sender nor the recipient is local to the server's mail domain. While third party relaying has some legitimate purposes, such as allowing mail messages to be routed around known mail problems, e-mail hijackers (or "spammers") primarily use it to obscure their identity while sending large amounts of junk mail.

Mail servers that are open for relay are routinely used by spammers to send unsolicited commercial email to Internet users. Setting relay-prevention policies is the resposibility of the email administrator and is an important part of running a resposible Internet site.

The recommended setting is to require SMTP authentication for any relaying.

See these other knowledge base documents:

Last revised 2006-9-29