Mail retrieval agent
From Wikipedia, the free encyclopedia
A mail retrieval agent (MRA) is a computer application that retrieves or fetches e-mail from a remote mail server and works with an MDA to deliver mail to a local or remote mailbox. MRAs may be external applications by themselves or be built into a bigger application like an MUA. Significant examples of standalone MRAs include fetchmail, getmail and retchmail.[1]
The concept of MRA is not a standardized in email architecture [2]. Although they operate like MTAs, MRAs are technically clients when they retrieve and submit messages.