Help!!!

Jeeps8796

Ok I think I found some wrong info in a book so want to make sure I am right.

A POP3 is for incoming email
An SMTP is for putgoing mail

Is this correct??

Ok next question... Lets say there is a problem and you cannot get to your email... Would you not go to the POP3 server by using it's IP address??

Thanks guys!!!

Webmaster

The answer to your first question is yes, SMTP is used to send mail and POP3 is a 'read-only' protocol. Here's a piece from a TechNote I've written for the Network+ exam:

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SMTP
The Simple Mail Transfer Protocol is an Application layer protocol used to transfer e-mail. Connects to TCP port 25.

POP3/IMAP4
While SMTP is used to send email, both the Post Office Protocol and the IMAP are use used to retrieve e-mail, the main difference between these two protocols is that POP3 can be used to access the "Inbox" folder only, the more complex IMAP4 can be used to access every server-based messaging folder (sent items, deleted items etc) hence eliminates the need for a local repository.
Defined at the Application layer. POP3 connects to TCP port 110, IMAP4 connects to TCP port 143.
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Your second question:
Depends on the problem, if you can't access the POP3 server because there is a problem with the DNS, then yes that could be the next thing to try.

Johan