emailrelay: emailrelay (SMTP proxy and store-and-forward MTA) emailrelay: emailrelay: E-MailRelay is a simple SMTP proxy and store-and-forward message emailrelay: transfer agent (MTA). When running as a proxy all e-mail messages emailrelay: can be passed through a user-defined program, such as a spam emailrelay: filter, which can drop, re-address or edit messages as they pass emailrelay: through. When running as a store-and-forward MTA incoming messages emailrelay: are stored in a local spool directory, and then forwarded to the emailrelay: next SMTP server on request. emailrelay: emailrelay: http://emailrelay.sourceforge.net/