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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

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SSL error: No path found from the leaf certificate to any root. Maybe an intermediate certificate is missing

I've setup a personal mail server using postfix, postfix-saslauth, courier (mysqlauthd, imap, pop) plus some well practices like SPF, DKIM and DMARC. This set up has been working fine for the last 10 years and today, for first time, I've tried to…
peris
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Dovecot expunge with POP3

I want to have Dovecot remove e-mails from a POP3 inbox that are over a year old, regardless of whether they have been read or not. From what I have read for autoexpunge to work the message should be marked as deleted. Not only would that seem to…
Imag1ne
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MS turning off Basic Authentication for Exchange Online in 2020

MS will be depricating basic auth on pop3 october 2020. Does pop3 will continue to work after that? Is it possible to use OAuth with a pop3 connection ? I can't find any documentation on that.
Sebastien
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Strange (mail related) traffic on my server

I'm noticing strange traffic on my webserver which is around 50kbps constantly. Doing a (few seconds worth of) tcpdump on the specific ip address, I get this (pardon the huge list): 09:33:02.385238 IP 40.101.8.117.25113 > my.server.com.pop3s: P…
Zippy1970
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pop3 IIS 6 , allow remote connections

I'm using a EC2 windows 2003 instance. I managed to install pop3 and i can connect to it locally (using outlook express with the remote desktop) and the server address is the machine name. I also added MX record on the DNS (mail.mydomain.com) but…
Que
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How to re download old emails from Server to Outlook 2007?

I configure email in outlook 2007. we are using our own domain email. I want to download all the emails from server. But it is not downloading. we are using Pop3. I tried Send/Receiveall but not downloading. I have 10000 emails on server. but it…
Liam neesan
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Can't set up POP3/SMTP mail on Windows 10

I am trying to set up a new Windows 10 machine, and am having problems with mail. I need to connect to an old server running POP3 and SMTP. The two programs that I can find that come with Windows 10 that seem to be intended for that (Mail and…
Olin Lathrop
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POP3 username including special characters

I need to access an Mailbox in Exchange Server 2016 via POP3. Unfortunately the username contains German special characters like 'ä' or 'ß'. POP3 service just gives an -ERR Protocol error. 17. Is there a possibility to access the mailbox via POP3…
Sebastian Seifert
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POP, SMTP and Mail Exchange servers are the same thing?

The MX record from nslookup tells the address of an MX server. In the email client, this address can actually be entered on both [incoming email server] and [outgoing email server], will this work?
bobo
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Outlook 2016 applies Exchange attachment size limits to other POP3/IMAP account

In our organization, there is a 10MB limit on email attachment size (through Exchange 2013). Most of our clients have another POP3/IMAP account too (in Outlook, besides their Exchange account). The problem is that when they want to attach files…
Mohammad
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Postfix with Maildir and popper as pop3 server

I am trying to run postfix with "maildir" feature and qpopper as pop3 server and I'm stuck. When I disable "Maildir" feature, popper is running fine, but I would like to make it work with MailDir. I tried also many maildir name such: MailDir, mbox,…
VGM
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Dovecot "Address already in use" error

I've some problem with starting dovecot server. I get the following error: Failed to start Dovecot : Error: service(imap-login): listen(*, 143) failed: Address already in use Error: service(imap-login): listen(::, 143) failed: Address already in…
user424249
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POP3 Server: ERR Unsupported authentication type

I've installed Axigen Mail Server and enabled SMTP and POP3 servers. After that, I've created domain (slava.local) and an user (slava). So now I can connect to the SMTP server (using telnet, open 127.0.0.1 25), and successfully send messages. Every…
AlexMelw
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Apache James TLS Woes

I am trying to set up a small email server using Apache James v2.3.2.1. My Java version for this installation is jre1.8.0_131. My server is running CentOS 6.9. I have the server running, but I cannot get clients to properly connect via…
Omaha
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Does Exchange 2013 have a pop3 connector like SBS 2011 did?

I'm looking at installing a server with exchange 2013 loaded. I have however just noticed that the current server has SBS 2011 and is using a pop3 connector to retrieve email hosted elsewhere. I don't think anything fundamental is changing so I…
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