What is email relaying?
(Note: out of necessity, the following is a gross simplification of the process, but hopefully, is enough to convey the general idea.) email relaying is defined as a CLIENT sending email from a SOURCE to a DESTINATION using one or more intermediate mail transfer agents (MTA). For our purposes, CLIENT is defined as the program that the sender is using to start the sending of email. SOURCE is defined as the combination of the sender’s email address (referred to as FROM) and the domain of the sender’s Internet provider (referred to as S-PROVIDER). Similarly, DESTINATION is defined as the recipient’s email address (referred to as TO) and the domain of the recipient’s Internet provider (referred to as R-PROVIDER). It should be noted that typically the sender has complete control over the CLIENT, FROM, TO, and initial MTA (iMTA); has partial control over the S-PROVIDER; and has no control over the R-PROVIDER, except in that it is derived from the TO portion. So when the sender initiates the
Related Questions
- Why do I get a "Relaying Denied: Authenticate with POP first" error when trying to send email through the server?
- How do I support multiple ISP accounts in the Postfix SMTP client (smarthost) for relaying email?
- Why do I get a relaying denied message when trying to receive data back as an email response?
