Questions tagged [email-server]

Refers to the hardware or software that make up a server dedicated to sending and receiving emails. Many popular modern email servers bundle other functionality for contacts and calendaring along email delivery.

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19 views

Postfix headers: Put FROM into REPLY-TO and change FROM

I've configured Postfix to use SMTP through another relay host. Now I need to change the email headers in order to be accepted by the relay host because the application which runs on my server is an ...
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6 views

Default Special Purpose Folders in Cyrus?

Most IMAP mail programs recognize special-purpose folders for junk, sent, drafts, etc. - the documentation on Dovecot shows how these can be created automatically when a new user is set up. The ...
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38 views

Send each email from a different subdomain?

There are clearly benefits of using a subdomain for sending email to protection domain reputation, but is this always true? What about the extreme case, where a spam domain sends every email from a ...
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28 views

postqueue -f displays an empty results even when mail is delivered successfully

How to read Mails Received to a user from Command Line terminal using postqueue ore some other utilises I configures a mail transfer agent postfix in my vps.if i deliver a mail from one of my gmail ...
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52 views

Mail Bounce due to Invalid string MX record

I'm new to managing a mail server and I encounter an issue with sending a message to a certain domain. Our emails are bouncing back on us with the error of the Invalid MX record string. I'm using ...
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42 views

Is it possible to determine the mailserver software (MTA) used based on a domain?

Given the domain from the MX record, is it possible to get the name of the mailserver software (MTA) used on this server? Example MX record for gmail.com returns (among others) gmail-smtp-in.l.google....
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11 views

Postfix virtual user for $mydomain

I'm running Postfix mail server with dovecot, and all works fine, but one mailbox. I have virtual setup in mail.cf myhostname = mail.myserver.com mydomain = myserver.com myorigin = $mydomain ...
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20 views

Exim4 mail address is undeliverable

I am trying to configure Exim4 on my ubuntu 20 server. I can send emails from the server (to my gmail) but can't send emails from the server to emails within the server nor from my email to the server....
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40 views

dovecot: Is it possible to remove a user?

If I do doveadm user '*' I see many users, including my server's username, docker user, and so on. I want to keep all those users, I just don't want them to be dovecot users, I only want to have one ...
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30 views

Postfix restrictions seemingly ignored

I'm currently trying to block a specific "from" domain that is getting forwarded from postfix to my personal e-mail. In the mail.log file I get something of the sort: Apr 29 14:42:49 <...
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Exim secondary server in cpanel for two accounts of office365

I had one account of office365, where I have configuration for secondary mail server via mail connector. In exim.conf, I had: hotmail_route: driver = manualroute domains = hotmail.com : outlook....
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31 views

add-apt-repository fails due to gpg key timeout

I am running a Mail-in-a-Box server on Ubuntu 18.04. As part of the setup/update script, it attempts to execute the command add-apt-repository -y ppa:certbot/certbot. This fails with the following ...
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29 views

Postfix/Dovecot cannot connect to MariaDB after crash

I am running a mail server on CentOS 8 using Postfix, Dovecot (virtual users) with MariaDB. ~1 week ago, Mariadb seemingly crashed and deleted most (?!) of the users, but failed "softly" and ...
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24 views

What to do if a specific postfix/dovecot user's account is hacked and being used to send spam?

I'm running a postfix/dovecot mail server. This morning, I discovered it was unresponsive. Turned out, /var/log was full. It appears one of the users has had their account hacked and it's being used ...
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48 views

Do I need to tune my DMARC settings (SPF align failure at final delivery)?

I've received my first (ever!) DMARC forensic report, and I'm not sure if it implies I should be setting something differently, or if this is desired behavior, or if it's undesired but there's nothing ...
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23 views

Postfix/Dovecot - User unknown in table, setting it up with /etc/virtual/domain/passwd

I'm trying for two days to replace Exim with Postfix. I'm able to log into my mail account and send mail from localhost to another sever with telnet, but i cannot send anything to my postfix/dovecot ...
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153 views

Postfix NOT WORKING on Port 465 (but working on Port 587)

My Postfix Dovecot mail server is working on 587 but not on port 465. I want to use my outlook client. i tried reading the instructions/documentations but nothing helped so far, I checked available ...
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79 views

How to Trace Who was Using my Mail Relay on Spamming?

I have a Postfix mail relay server running as Exchange smarthost as well as hosting another mail locally. Last week I observed an attack on this server, someone is using it to send massive emails to ...
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81 views

Why email response comes from: Postmaster

I've created a sieve script that filters for particular words in Subject, drops the body and sends notification to the recipient and sender. Everything works well but the only thing I can't figure out ...
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48 views

Postfix without queues?

I would like to use Postfix as an MTA to deliver emails that I create locally using a Python SMTP client. But I would like to handle the re-sending of emails manually, rather than using Postfix's ...
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1answer
27 views

Can I migrate some users to a new email server while keeping the majority using the old one?

I am running a small email server for a small of group of people (~30, one domain) and after having several issues with it, I would like to test the Zoho servers. Will it be possible to only migrate a ...
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19 views

postfix limit sending rate PER MX domain?

I know postfix can limit concurrent connections to recipient "domains", but I am sending emails to websites from different domains that may use the same email service (Google, Outlook, etc.) ...
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224 views

Why are some emails not reaching my inbox?

I'm very new. I set up email on my domain (postfix, dkim, dmarc, spf, dovecot... s-nail, Roundcube) by following reliable guides. I now have 9 addresses, 3 different FQDNs. Emails from all addresss' ...
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21 views

Barracuda Bouncing Emails

I'm not too familiar with all the intricacies of email servers and am curious what you guys think this looks like. Is the receiving blocking it or is this something on our end? The receiving company ...
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28 views

Google Postmaster: IP reputation of subdomain and main domain identical

We have a main domain, example.com. We use this to send regular emails via Google GSuite. We also have a subdomain, say sub1.example.com. We use this to send campaign emails through an email marketing ...
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Why isn't the MX record propagating after pointing a domain to Yahoo Mail Server?

I have bought a domain https://kmtc.com.sa/. The domain provider is marcaria.com. It is currently pointed to a Hostinger for the web files. The Yahoo mail server is supposed to be working with Yahoo ...
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37 views

DKIM validation fails only on Outlook

I'm configuring OpenDKIM to sign miltiple domains with the same key on Pstfix. I followed this tutorial with s=mail and d=example.com. SigningTable: * mail._domainkey.example.com KeyTable: ...
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27 views

Two MX records for one domain, but only one server should be the receiving one

We have two email servers (sender_and_receiver.example.com and send_only.example.com) which handle the mail exchange for one specific domain (example.com). As the names implies, one server is sending ...
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89 views

Is vps server or dedicated server possible as fax server? [closed]

I want the mail to fax . I am currently using the alltofax.de to send fax from a mail. I want to know if I can build a fax server on my dedicated server. I studied about Hylafax, but said that modem ...
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1answer
34 views

Postfix apparently set up but connection is refused

I've set up my postfix server according to this tutorial: Email with Postfix, Dovecot, and MySQL However, I'm getting connection a refused error. The mail queue says mail is coming in, but it is not ...
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42 views

PHP mail function on Google Cloud Compute Engine?

I have a php website hosted on Google Cloud Compute Engine. I also have a paid Google Workspace account for my emails, etc. I would like to use the mail function in php to receive emails from my ...
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1answer
44 views

How to forward email to GMAIL using EXIM4

I have a new exim4 server and I need to forward some addresses to a gmail address. support@myeximdomain.com --> mysupport@gmail.com I have created the router with driver = redirect and everything ...
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11 views

Discard an email in postfix when the reply-to address is different from that of sender

I've setup virtualmin and the emails are working fine with the Postfix server. However I'd like to add a feature where, in case somebody tries to abuse the server and tries to send an email with a ...
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1answer
48 views

Is an email alias technically the same as a forwarding internally?

I know there are several drawbacks using email forwarders. So I was wondering if adding an alias to an address is the same as adding a forwarder to that email address? It just differs how tools like ...
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27 views

Use of Gmail and Outlook simultaneously

Currently we are using Gmail (G suite) in our organisation and we are planning to move to Outlook (Microsoft). All employees currently have the same email address for both Microsoft and Google. For ...
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37 views

Postfix/Fail2ban, Send mail to admin on problems

I would like for Postfix if possible, or Fail2ban if possible (without banning) to send a notification email to root or an admin account with the logline when something wrongs happens when sending an ...
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23 views

Redirect emails based on the extention with postfix

I have email alias called reports which I like to redirect to a default subset of emails. But I'm looking to implement something like sending emails to reports+reportName and have a different subset ...
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17 views

Postfix SASL auth with limited domain

I'm trying to set up postfix to allow relaying when Client SASL Auth success and It's SASL username and sender_domain its allowed. Example : user1@exmaple.com allowed to use sender_domain user1.com ...
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60 views

How to enable ESMTP in postfix server

I have setup a posfix mailserver and some of the messages (sent from Microsoft exchange online) are rejected with below error. SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds, which ...
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34 views

How would I set up Debian 10 and Postfix security for a limited send-only email setup?

I (me and my wife) run a small Debian 10/Buster web server with a few websites for friends and need to set up outgoing email. I've got to the point where I can send emails from the command line (echo &...
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33 views

How to make sieve-filter use virtual users

sieve-filter -e -W -u user@example.com /path/to/sieve/file.sieve INBOX fails with the error: sieve-filter(root): Fatal: Unknown user The output of doveadm -n is auth_master_user_separator = * ...
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21 views

Send Monit E-Mails via Exim

I installed monit on an Ubuntu 18.04 server and I would like to configure it to send e-mails to my personal e-mail address. I heard that I can send them via the installed exim. However, it does not ...
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1answer
30 views

How do I not lose my Rackspace emails when I use WordPress DNS?

I use Rackspace for my email currently and would like for WordPress to host my website. When I pointed the DNS to WP, I lost my emails in Rackspace. When I pointed the DNS back to where it was ...
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1answer
45 views

Postfix: How to keep an email in the mail queue for further investigation?

Is there any way to keep an email in the Postfix mail queue for investigation/debugging purposes? I want delay the delivery and the email to be kept in the queue which let's me check it's contents. ...
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1answer
172 views

CentOS webmail setup using Windows Server DNS

I'm having problems configuring CentOS7 to host as a mail server using Windows Server as a DNS, and cannot figure out where the problem is. The mail server and windows server are connected to a centOS ...
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48 views

Setting up MX records for two servers with same hostname

In my DNS records, I have 5 MX records with my hostname being the main domain name of my site example.com. These 5 records are aspmx.google.com, alt1.aspmx.google.com, alt2.aspmx.google.com, alt3....
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24 views

New SSL Cert now showing up for Postfix in browser (Ubuntu, Namecheap)

I'm a newbie trying to wing it after our Sys Admin left. I needed to update our wildcard certificate and copy it onto our mail server. I renewed the cert at Namecheap, downloaded it, and installed it ...
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63 views

Postfix. SMTP (Send only) remote authentication

So I have enabled an Ubuntu Server 20 in the cloud with a dedicated public IP, and I want to use it as a SMTP server for MyDomain.com. I have setup DNS and PTR, so this server is mail.MyDomain.com I ...
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27 views

Postfix forward mail sent to own domain to gmail

I have a domain "mydomain.com" with an SMTP (send-only) Postfix Server on it. For receiving, i use gmail. (MX Records are set to gmail) Everything works fine with sending out mails, except ...
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32 views

Postfix for outgoing mails

I installed Postfix on Centos7 and I want to use this server as a mail server for outgoing mail. The server only has to be accessible from the internal network and not from the Internet. Postfix ...

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