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Hi,
As you may know I am working on a home PHP webserver.
I have the LAMP stack operational along with BIND and Let's Encrypt. I
need to understand and get Postfix and Dovecot functioning.
Here is what I have pulled together. Please le me know if this is
accurate, if I let anything out, or any other information I need to
know. Thanks!!
MUA : Mail User Agent – Your email client. (port 587)
MTA : Mail Transfer Agent (port 25) (port 587 or 465 ?)
MDA : Message Delivery Agent
MSA : Mail Submission Agent
SMTP : Simple Mail Transfer Protocol
POP3 : Post Office Protocol
IMAP : Internet Message Access Protocol
SSL : Secure Socket Layer
TLS : Transport Layer Security
• User client (Mail User Agent) sends an email to the Mail Transfer
Agent via port 25, 587, 465, or 2525. I’ve read that port 465 should no
longer be used.
• I read port 587 should only be used for submissions (i.e., mail client
to mail server), port 25 should only be used for relaying (i.e., mail
server to mail server communications).
• Mail Transfer Agents transfer email to other Mail Transfer Agents via
port 25 exclusively.
• Mail Transfer Agent stores the email on the server.
• The user client (Mail User Agent) interacts with the mail server via
the Message Delivery Agent using POP3 or IMAP. This transaction can be
secured by a Secured Socket Layer certificate referred to as TLS
(Transport Layer Security), POP3S or IMAPS, or not secured POP3 or IMAP.
• The POP3 and IMAP and ports:
◦ IMAP - 143
◦ IMAPS - 993
◦ POP3 - 110
◦ POP3S – 995
Thanks!!
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