Sunday, March 8, 2015
How email communication works
MUA (Mail User Agent), i.e. Mozilla Thunderbird, Microsoft Outlook
MTA (Mail Transfer Agent)
MDA (Mail Delivery Agent): actually storing the message to disk, may also do filtering mail or delivering to subfolders
Sender MUA--->Sender's mail server [MTA]--->Recipient's mail server [MTA]--->MDA
| ^
| | IMAP/
| | POP3
V V
DNS server Recipient MUA
Dovecot is one program which can provide that IMAP and POP3 server functionality.
* Note that Dovecot is NOT responsible for receiving mail from other servers.
Dovecot is not involved with actual reception of e-mail. That functionality is provided by an MTA such as Exim or Postfix
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