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Yes<br />
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POP3 is the protocol used to receive mail using the Post Offic Protocol - it uses TCP port 110<br />
SMTP is the protocol used to send email - it uses TCP port 25
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Yes

POP3 is the protocol used to receive mail using the Post Offic Protocol - it uses TCP port 110
SMTP is the protocol used to send email - it uses TCP port 25

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What are POP3 server and SMTP server? These are for mails, right? 
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What are POP3 server and SMTP server? These are for mails, right? 

POP3

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.