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student25

join:2011-01-14
Charlotte, NC

POP and SMTP

POP and SMTP
Hello Forum,

in order to configure our email to send and receive email we need need to use an email client program that supports the Post Office Protocol (POP3) and Simple Mail Transport Protocol (SMTP) standards.
POP is a protocol for retrieving mail from the ISP mail server while SMTP is used for sending mail (mailman).

The mail server has an IP address. Port 110 and port 25 are the two logical ports on the mail server....

Sometimes, when our email is not working correctly we are told to make changes to our client configuration....

Does that imply calling another mail server? Do ISP have multiple mail servers?
Or can we change something about POP and STMP? They are just protocols...can we change their ports?

thanks
student25

thanks
student25

student25

join:2011-01-14
Charlotte, NC
POP3 is also called an incoming Mail Server, like IMAP and HTTP.
SMTP is called the outgoing Mail Server.

Are the incoming and outgoing mail servers the same physical computer or two different ones?

thanks!


LBDSL
Lightning Bolt

join:2002-01-07
Auburn Hills, MI
reply to student25
is this homework?

supergeeky

join:2003-05-09
United State
kudos:3
reply to student25
Your ISP may elect to run these services on other ports besides the well-known standard.

For example SMTP is typically port 25, but sometimes people's own firewall software, or another ISP in-between will block port 25, so they ask you to try 587 or 465, or perhaps use different authentication options.

Same goes for POP3, commonly on port 110, but sometimes on 995.

It does not necessarily mean they are running different server, it could, but probably just on multiple ports.

It's also entirely possible your ISP is just lousy or having problems, and they are "stalling" by asking you to change your client config, when really that won't make any difference and the problem is actually on their end.