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A mail retrieval agent (MRA) is a computer application that retrieves or fetches e-mail from a remote mail server and works with a mail delivery agent to deliver mail to a local or remote email 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.〔(MuttWiki: MailConcept )〕 The concept of an MRA is not standardized in email architecture. Although they operate like mail transfer agents, MRAs are technically clients when they retrieve and submit messages. ==Delivery mechanisms== The mail retrieval agent may support delivery of retrieved mail via the following mechanisms: * Via a mail transport agent (Listening for SMTP transfers on port 25) * Via a mail delivery agent * Direct delivery to an mbox formatted mailbox * Direct delivery to a maildir directory * Output to standard output 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Mail retrieval agent」の詳細全文を読む スポンサード リンク
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