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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

243 questions
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Handling badly folded long Return-Path header gracefully

I've got a problem with my POP3 provider delivering me e-mails with broken Return-Path header. When it's long, it gets wrongly folded into multiple lines, in the middle of e-mail address like this: Return-Path:…
Maciek Łoziński
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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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Using e-mail on malware infected computer/network

I have an important (+10 outlook accounts) but very ignorant client who refuses to accept that there is malware on the company's computers. Malware that steals Outlook data to send and receive spam. The situation went on a limit, due to the…
André A.
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Can't get emails into Outlook client

I have moved hMailServer onto a different server. When I use Outlook and log the communication within hMailServer I get the following; Creating session 737 ... SENT: +OK POP3 RECEIVED: CAPA .... SENT: +OK Mailbox locked and ready RECEIVED:…
CarbonMan
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Login Fail for IMAP on Exchange Server 2016

I have deployed Exchange Server 2016. I am able to send email over 587 while I face Login failure over IMAP 993 and POP3 995. Over Microsoft Tool https://testconnectivity.microsoft.com/ IMAP Test passes but using any other means (Java Mail or…
MalTec
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Train spamassassin with POP3 or copied emails

I am still new at this so be gentle. I have setup a server with postfix, dovecot, apachce2, PHP5, PHPmyadmin, spamassassin, clamav, amavis. Now to train spamassassin apperently I need to use IMAP. But can I use POP3 saved emails in any way? Is it…
Cudos
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Can we, as a business, do anything about a PHPmailer spoofing hijack?

We use business email addresses from a private domain via pop3 on gmail, but our hosting company have started suspending us daily because one user's account has been hijacked by a phpmailer sending spam from his address. The hosting company say its…
Michael Richmond
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Haproxy Load Balance IMAP,POP3,SMTP: Unable to use proxy 'imap' with wrong mode, required: http, has: tcp

I try to reverse proxy all the incoming email traffic to a mailcow-dockerized solution in my debian server via haproxy: The haproxy.cfg configuration is: global log /dev/log local0 log /dev/log local1 notice chroot…
Dimitrios Desyllas
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POP3 service is not ready even though the service is running, Telnet does not return POP3 OK status?

I am working on a Windows 2008 R2 server running Exchange 2010 and I am currently trying to troubleshoot a POP3 connectivity issue that is preventing some outside remote accounts from logging into the mail server. The certificates are valid and I…
brndng
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pop3 mail proxy on linux server

I have an ISP pop3 account and I need to retrieve mails on my server (ubuntu server) to feed an IMAP webmail (roundcube) installed on my server too. So, I need : my_ISP_POP3server -> POP3proxy_onMyServer -> IMAPserver_onMyServer ->…
partout
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Using POP3 and IMAP for same account

When using a mailserver I know that IMAP leaves all the mail in the server while pop3 downloads it and deletes it (sometimes after a few days, depending on the mail client configuration options). My question is, what happens when using both…
Miguel01
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Hmailserver and Outlook 2013 can send but not receive any emails in POP3 or IMAP

I'm having problems receiving any email from outlook. I can send email through smtp using comcast (my isp) without a problem, but I can't receive any email using either personal pop3 configured in hmailserver or the imap from my isp. If anyone can…
user3771570
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the delivery report includes the original letter

We have installed windows server 2008 R2 Enterprise and Microsoft Exchange 2010. The clients use Outlook from Microsoft Office 2010. if we use POP3 protocol between exchange and user then the delivery report from server come with the included…
Sam King
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Courier-IMAP pop3d auth over mysql

I've got a task of migrating one mail server from one box to another and so far I have configured Postfix and it's working. But, Courier pop3d server fails without exception. So, I have Courier pop3d server which needs to authenticate user agains…
Jovan Perovic
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What happens inbetween SMTP and POP3?

I understand SMTP, and to a lesser degree POP3, but I feel like I'm missing a large chunk inbetween. I see this image on a Microsoft page: (source: microsoft.com) and I feel like what I'm missing is the "Internet" part. Basically: does the SMTP…
Dave Cousineau
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