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by Karl Plesz on October 13th, 2007
SMTP is the protocol (mechanism) used to get email from the sending computer all the way to the recipient's email server. This could be at a company, an ISP, or a web mail hosting service (like Hotmail).
POP3 is the protocol used to download the email message from a mail server to a computer using an email client program (like Outlook). When you check your email, the messages are transferred to your computer and deleted from the server. Web mail doesn't use POP3, because the messages stay on the server. You are viewing them remotely.
by glnflwrs on October 13th, 2007
POP3 is the incoming e-mail protocol. You receive e-mail through POP3.
SMTP is the outgoing e-mail protocol. You send your e-mail through SMTP.
Both of these are attributes of your ISP and their mail servers.
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