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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.

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Is Gmail removing "Received" in headers?

I added my professional email to my gmail account as POP3 and set it as default for sending emails. Strangely, when sending emails to other emails like hotmail, or even by using tools like mail-tester ...
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How does Microsoft Exchange determine which mailbox database a mailbox is in upon authenticating via POP3?

Performing a Microsoft Exchange 2010 to 2016 migration and everything is ready for transition besides this one problem. I have an internal CNAME DNS record mail.domain.tld that is pointing to the ...
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Office 365 with SSO, but needs email to be accessed via POP and send mails via SMTP

We are moving from Godaddy to Office 365. Many of our staff use Thunderbird and a few use Gmail to read office emails (collection emails via POP). Office 365 uses SSO by OneLogin to authenticate users....
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Map a subdomain to an individual email address

say I want to redirect multiple subdomains to different email addresses So: *@it.example.tld --> it-support@mail.tld *@finance.example.tld --> finance@mail.tld *@hr.example.tld --> hr@mail....
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does SSL/TLS STARTLS full encrypt connexion for POP and IMAP

I am configuring POP and IMAP accounts in thunderbird mail client. Here are 2 options: Security: None SSL/TLS STARTLS Authentication method: Normal password Encrypted password Kerberos / GSSAPI ...
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1 answer
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Fetchmail does not use the indicated protocol

I'm trying to setup fetchmail for download some mail from gmail using pop3. The problem, as you can see, is that fetchmail instead of use the pop protocol will use imap. For being sure to not have ...
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1 answer
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Clarification on the configuration of a mail server

I would like to start by saying that I have not seen any other forums or posts that clearly explain this thing. If there are, my poor English skills probably didn't make me understand the solution ...
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1 answer
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How to proxy IMAP/POP3 connection to appropriate backend mail server by domain

I have system with multiple email server (exchange, zimbra) for multiple domain. So when users of domain A want connect to server for getting email they have to use IP of server A (Ex: 192.168.10.253),...
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1 answer
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Access POP3 content from other computer

I have a tough mission, that I have no idea how to accompish it. In our company, all the e-mail accounts are configured as IMAP accounts, therefore we can access the e-mail from wherever. However, ...
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2 answers
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Best way to serve mails from public SMTP server to the internal mail server without initiate connection from DMZ?

I have a basic question for a mail setup which i have to implement. We have an SMTP server (Postfix) in DMZ, which should receive and accept all mails for our internal users. Then we have a internal ...
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1 answer
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Gmail connection error pop3 on dovecot postfix server

I configured a Dovecot Postfix mailserver on Ubuntu with letsencrypt certificates. It runs fine on mail clients like MacOS mail both in imap and pop3. No errors. However after adding two accounts to ...
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Is possibile to download to Exchange 2013 mailbox an external Pop3 mailbox?

Once a time Exchange let download an external mailbox to a local mailbox through a "Microsoft Connector for POP3 Mailboxes". Then I could read my external/pop mail to a local exchange ...
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Downloading IMAP/POP3 emails on a remote server to a local mail server

I need to setup a local server that will download email (IMAP or POP3) from remoteserver e.g gmail or webmail, to a local server. Such that users can have structured access (either via mail client or ...
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-3 votes
1 answer
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E-mail transmission example

RFC standards literally force us to accept unencrypted connections on port 25. To understand why, we have to understand how emailing works. But emailing is quite a complex topic and I created this ...
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How To configure Postfix and Dovecot for remote IMAP / POP sending of email on Fedora 32

Background I've been the administrator since inception of this 24-ish year old site which hosts a lot of virtual domains, etc, and from the late '90s one important feature we had working was allowing ...
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2 votes
2 answers
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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: ...
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1 answer
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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 ...
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Why cannot I retrieve emails from Cyrus-imap pop3 server?

When I click "Get Messages" in the Thunderbird client, I cannot retrieve any email from my Cyrus-imap pop3 server. I configured Thunderbird client to use pop3 port 995, Connection security: ...
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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 ...
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Email Disappears between IMAP and POP

I have a client who has an online store, and receives order notifications by email. Their order emails are flowing into their mailbox on the server, but never show up in Outlook. Their Outlook is ...
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1 vote
2 answers
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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; <my email> Arrival-Date: Sat, 11 Jan 2020 03:55:20 -...
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MS turning off Basic Authentication for Exchange Online in 2020 [closed]

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.
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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 ...
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2 votes
4 answers
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Get new mails immediately

Up to now we get new mails with the tool getmail. It works well. There is a cron job which runs every minute. Is there a way to get the mail faster? I see two ways: Solution 1: run the cron job ...
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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 ...
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1 vote
1 answer
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Using e-mail on malware infected computer/network [closed]

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. ...
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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:...
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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 ...
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2 votes
0 answers
1k views

HAProxy - IMAP, SMTP, POP3 - Multiple Servers

Please accept my apologies if this is off topic or does not apply on a more broad scale (i've searched the internet and can't seem to find a solution anywhere). I'm not sure if this is even possible, ...
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-1 votes
1 answer
1k views

Can't login to IMAP/POP3 server external

I have installed Postfix, Dovecot and MySQL via this tutorial (https://www.linode.com/docs/email/postfix/troubleshooting-problems-with-postfix-dovecot-and-mysql/). When I do the following command, I ...
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4 votes
2 answers
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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 ...
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1 vote
1 answer
6k views

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 ...
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1 answer
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Security issues with SMTP

I am looking at SMTP and POP3 and am trying to find the security issues with both protocols, I have found that SMTP can be easily impersonated on port 25. However I am struggling to find security ...
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1 answer
255 views

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 ...
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1 answer
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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 ...
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2 answers
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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 ...
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3 votes
1 answer
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How do the servers mark the email as read

I'm looking to know how servers mark emails as read and unread with IMAP or POP. I've logged into my server (using cPanel) and navigated to my mail directory and downloaded the same email file, ...
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1 answer
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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 ...
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2k views

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-...
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1 vote
1 answer
7k views

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 /...
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2 votes
1 answer
3k views

Docker Mailcow: Nginx as Mail reverse proxy to docker container images using SMTP, POP3 and IMAP

On my server I am running a mailcow:dockerized solution on a debian server and I want to use the nginx not only as an http reverse proxy but also as an SMTP imap and pop3 too as seen in https://www....
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0 votes
1 answer
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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 ...
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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 ...
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-1 votes
2 answers
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Can send test mail via Outlook, but cannot connect to Exchange Server with POP3

We are testing Exchange Server 2016 mail server. We can connect to user's mailbox via OWA (Outlook Web Access). When testing POP3 mail from Microsoft Outlook (on a non domain-joined PC) we can send ...
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2 votes
0 answers
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Nginx + mail open ports vulnerability

I'm just thinking out loud here and wondered if i have to open up ports (inbound) to still use my mail. Isn't it possible to redirect trafic lets say imap or pop3 through a subdomain (imap.domain.tld ...
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5 votes
3 answers
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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 ...
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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 ...
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-1 votes
1 answer
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Does secondary or backup MX server deliver queued emails to users?

Suppose, I have a primary MX: mx1.abc.com with priority 5 and secondary mx as mx2.abc.com with Priority 10. I have independent IMAP/POP servers configured to fetch email for abc.com domain. (imap.abc....
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-1 votes
2 answers
873 views

How does IMAP/POP Server fetch emails from my SMTP server?

I have a domain abc.com with MX record/SMTP server mx1.example.com. My IMAP/POP server (incoming server) is imap.example.com and pop3.example.com. How does my IMAP and POP server fetch emails from ...
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0 votes
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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 ...
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