Created
July 31, 2018 13:02
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Email Architecture Overview
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| MUA – Mail User Agent e.g. Outlook, Mozilla Thunderbird; Downloads emails from MDA via POP3/IMAP; Sends emails via tcp:587; | |
| MTA – Mail Transfer Agent e.g. Kaspersky Secure Mail Gateway - SMTP server - listens tcp:25 and comunnicates with another MTA; placed in DMZ; | |
| MDA – Mail Delivery Agent e.g. MS Exchange, IceWarp - POP3/IMAP server (local delivery server) - communicates with MTA via tcp:25; stores/forwards emails; | |
| Email NetFlow | |
| ################ | |
| MUA -> MDA(tcp:587) -> MTA(tcp:25) -> INTERNET -> MTA(tcp:25) -> MTA(tcp:25) -> MUA(tcp:110/143) |
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