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Questions tagged [pop3]

POP3 stands for Post Office Protocol used by e-mail clients to retrieve messages from a remote e-mail server.

As well as being supported by local e-mail clients POP3 is also supported by most webmail services such as Hotmail, Gmail and Yahoo! Mail.

POP3 is just one communications protocol on the web. Others include:

  • Transmission Control Protocol (TCP)
  • User Datagram Protocol (UDP)
  • Internet Control Message Protocol (ICMP)
  • Hypertext Transfer Protocol (HTTP)
  • File Transfer Protocol (FTP)
  • Internet Message Access Protocol (IMAP)

POP3 on Wikipedia

247 questions
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Security risk of POP before SMTP

I received an email from one of our servers this morning (CentOS, with WHM running LAMP) stating: The server has POP3 before SMTP enabled. For security reasons, cPanel highly recommends that you disable this functionality. I have done some…
GeoffAtkins
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Mail server for Windows 2008

I'm going to get a Windows 2008 dedicated server sometime soon. I'm going to have my website hosted on it, so, I also want to run a mail server on the same machine to receive any mail sent to the website (I use the SMTP Server in IIS for sending…
Mee
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Recommended personal mail server setup

I've been using GNU/Linux for servers, mostly Debian. I am thinking of keeping my personal email on a centralized server. I have some GMail accounts, and a few from different domains from several web projects which are hosted at the corresponding…
Fernando Briano
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SMTP sent E-mail not copied to Sent Folder

I discovered that some (few) providers don't copy into the Sent folder those E-mails which are sent from mail clients through SMTP. They only copy them to the sent folder if you send them from their web interface, everything sent directly through…
user9948
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Can I safely remove all mail services from CentOS?

I've inherited 3 legacy shared servers all running CentOS. We no longer offer any email subscriptions from our servers and have migrated everyone to cloud services. These servers host about 60 WordPress sites each. Across the 3 servers I have the…
David
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test a pop3 secure ssl port 995

i am trying to login to microsoft exchange online using openssl openssl s_client -connect pop.mail.apac.microsoftonline.com:995 however when i pass the USER command it fails +OK The Microsoft Exchange POP3 service is ready. user…
krisdigitx
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Manage multiple account from just one

I'll like to know if there is a way to manage multiple email account just from one. I have about 40 or 50 external POP3 email accounts, is there a way to forward all entry emails from those accounts to just 1, and then when replying from that…
user2348511
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What's the difference between POP3 and IMAP for e-mail?

How does IMAP differ from POP3 and what are the pros/cons of each and why choose one over another?
Peter
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Security Risk involved in disabling SMTP authentication on POP3 Server?

I provide IT Services to a client who, for the longest time in the world, has been using a POP3 server from Network Solutions to handle their email. At this time, I'm introducing the McAfee SaaS email protection to give their email some type of…
steve02a
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Dovecot, POP3 and Gmail

I setup Postfix and Dovecot on a new Ubuntu box following these directions. From a client machine, I validate that POP3 seems to be working telnet mydomain.com 110 +OK Dovecot ready. USER me@mydomain.com +OK PASS mypassword +OK Logged in. quit +OK…
Eric J.
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How to configure an iPhone to download complete email everytime

We have a user with an iPhone 4s who receives email via POP. His email has been working normally until recently when he reported that the body of some messages do not download. In place of the body the iPhone displays, "This message has not been…
Brad Heiple
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Message Queue building on Barracuda Spam Firewall

I have just installed our new Spam Firewall, and all seemed well. But the Spam Firewall has now decided to put all mail in a message queue and I have no idea how to force it on or anything as there doesn't appear to be anything on the GUI to manage…
stead1984
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Gmail POP3 with openssl command line: hangs while RETR-ing

I want to use openssl s_client for accessing Gmail POP3S server. I am doing the following: $ openssl s_client -connect pop.gmail.com:995 +OK Gpop ready for requests from d11pf35377217wam.36 USER +OK send…
Sabya
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wildcard ssl certificate - exchange 2010 - POP/IMAP problem

previously we have requested a wildcard ssl certificate from godaddy for our major domain. one of the reasons was the new established exchange server 2010. usually you require following names included in certificiate: FQDN (e.g.…
Sise
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Understand if email error is due to sender or recipient server

When I try to send emails to a well-known customer of mine, I receive this error: Reporting-MTA: dns; googlemail.com Received-From-MTA: dns; Arrival-Date: Sat, 11 Jan 2020 03:55:20 -0800 (PST) X-Original-Message-ID:…
Mark
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