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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91 views

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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24 views

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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1answer
23 views

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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1answer
60 views

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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1answer
67 views

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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20 views

Where to find imap/pop3 data for email - from ovh to google workspace

When I bought domain in ovh I chose it with MX plan (without creating email account). Then I added this domain to mailgun for sending emails from webpage and to google workspace (g suite) as domain ...
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1answer
190 views

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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2answers
87 views

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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1answer
544 views

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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170 views

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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121 views

can't retrieve emails from my server in gmail (POP3)

I have installed postfix and dovecot on my centos server in order to send and receive email with SMTP and POP3 protocols in gmail. SMTP works well and I can send emails with gmail, but I have some ...
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0answers
60 views

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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1answer
76 views

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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1answer
4k views

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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1answer
161 views

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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34 views

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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4answers
405 views

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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2answers
1k views

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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1answer
31 views

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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0answers
45 views

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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137 views

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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0answers
848 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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1answer
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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2answers
532 views

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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1answer
5k 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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1answer
484 views

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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1answer
229 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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1answer
2k views

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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2answers
187 views

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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1answer
724 views

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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1answer
191 views

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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1answer
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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1answer
6k 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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1answer
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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1answer
316 views

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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1answer
567 views

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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2answers
624 views

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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0answers
129 views

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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3answers
4k views

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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0answers
184 views

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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1answer
285 views

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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2answers
758 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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150 views

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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605 views

postfix mails stuck in mailqueue

I ran into a problem, I'm trying to set up postfix mail server (I'm using webmin), everything seems to work fine, I successfully connected outlook to POP3/SMTP, but as soon as I send an email, it gets ...
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1answer
38 views

OSX Server - Logging POP Mail Connections

I am trying to keep a running record of the users that are accessing our OSX 10.6.8 Mail Server using POP instead of IMAP. The Server Admin application features a running list of Mail connections ...
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0answers
451 views

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 -> ...
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1answer
75 views

What happens if you have one imap client and one pop client?

I have a mailbox on my server which accepts POP and IMAP connections. If I connect one remote client via POP and another remote client via IMAP, what will happen? Will the emails remain on the ...
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2answers
658 views

Prevent using cleartext passwords in e-mail protocols? [closed]

Checking an older laptop in my possession, I found that all of the POP accounts set up on that device, were sending passwords in clear text when Sending and Receiving (Found this with the assistance ...
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1answer
671 views

Postfix/Dovecot Email Server (on Raspberry Pi) - Unable to configure POP3S connection with Gmail

I've been trying to configure my Raspberry Pi (Raspbian Jessie Lite) as a postfix/dovecot email server for my domain dominicgkerr.co.uk. Using a combination of the fantastic walkthroughs written by ...
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1answer
64 views

Use two different mail servers for a single domain [closed]

sorry for my english, I have used Google Translate. I have a Arsys host (an ISP host from Spain), which gives me 50 email accounts with 6GB of storage each. I have about 6 accounts of those who need ...

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