Questions tagged [postfix]

Postfix is a free and open-source mail transfer agent (also "MTA"), written in 1997 and still actively developed.

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15 views

How to figure out if/why/where my mail server has become a spam source?

NB: while I am by no means a mail expert, I've been running my own mail servers since the 90s. I've been self-hosting on AWS since 2011, and have been running this particular configuration since Feb 7,...
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header_checks is applied to mail body (CentOS 7 + Postfix 2.10.1)

I have received SPAM e-mail, added regular expression to header_checks about it and when tried to forward SPAM e-mail as attachment, then this check triggered and rejected my forwarded e-mail. Regexp ...
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Postfix access and subdomains?

I am trying to include in my /etc/postfix/access some domains from spammers (please no discussion if this is useful or not....). Accordings to the documentation it should discard any incoming mails ...
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Send e-mail as non-existent user for domain

Sorry I didn't know how to really word this in a short title, it's not just a simple send-as question lol. I own a domain that I use as a catchall so that someone can send anything@mydomain.com and it ...
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Zimbra Does not send email

So i managed to get the Zimbra installed today, and Its on here https://mail.betheluniversityeu.gq:7071/zimbraAdmin/ i am using Digital ocean as VPS to run the mailserver I have this issue, when I ...
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How to pass the envelope RCPT address from postfix to dovecot via LMTP?

TL;DR I have a postfix installation with dovecot using LMTP for some virtual domains running. I want to use sieve filtering on the recipient address, the mail was delivered for and accepted by postfix....
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Prevent use of procmailrc by some users

We have an e-mail server running Postfix (SMTP) and Dovecot (POP/IMAP) on Debian 10. Users cannot log directly on it (SSH), but have access to their homes through NFS. We would like to use Procmail to ...
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Attribute a static public ip to a pod for outband traffic

In my datacenter , i implemented a kubernetes infrastrastructure with 3 workers and one master node . Actually i'm looking to build 5 pods running postfix mail server , but because of risking to be ...
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118 views

FInding 'server log' referred to in this postfix error

This is a bit embarassing, but I'm stuck at the first step of debugging a postfix+dovecot setup on Debian after following this guide. Sending email from my server works, but receiving doesn't. I get ...
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How to store emails in each user folder on POSTFIX mail server

I am using cantos 8 i installed post-fix and dovecot for mail server. When i try to send emails to my email server, all emails going to my root folder.My post-fix main.cf file i set the mail directory ...
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postfix dont deliver to virtual emails

I'm installing a full mail server with postfix and dovecot. I used to manage virtual users and domains with postfixadmin. Now When I send an e-mail to a real user on the server. I receive that e-mail ...
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Postfix non privileged docker image

We are trying to create a docker image for postfix similar to this one here. Later we want to use it as part of a kubernetes deployment. Therefore the container needs to run as a non-root user (...
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rspamd does not sign all outgoing mail

I have been using rspamd for a while. I am operating a mailserver which is responsible for more than one domain's mail. Since a few days I noticed that the dkim_signing module of rspamd is not signing ...
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Unclear about postfix and hostname in ubuntu

I need to preface this by saying I am in no means an expert with linux or servers. I have a digitalocean droplet that I am using as a webserver for a couple of domains. I am looking to implement a ...
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Postfix SMTP Relay for Multiple Mailboxes

I currently have a local postfix server configured with an Office 365 SMTP relay. The configuration makes use of SASL and uses sender_canonical to rewrite the address. The server receives mail from ...
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SOHO Postfix/Dovecot configuration for small web app and user base

I own two domains, lets call them domain1.com and domain2.com for examples sake. These domains are used in my small home office mostly for family and friends to have email address at domain1.com and/...
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Postfix configuration issue on Ubuntu 20.04 sending smtp through Gmail from localhost configured LAMP server

While attempting to send mail though the terminal, I get a Postfix error as: sudo tail /var/log/mail.log Returns following Postfix error: postfix/error[37001]: ... relay=none, delay=0.04, delays=0....
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Postfix relay some domains only from some senders

I try to relay some email from my postix server like that : First if the email is from a specific sender and the destination is in a list of domains, i relay to another smtp If the email is for anyone ...
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Postfix: Allow sending only from virtual users used by dovecot

So I have set up my postfix server with dovecot according to this tutorial. Receiving emails works fine, sending them too. But these days I had the problem that my postfix started sending emails from ...
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Not receiving emails (no bounced errors) but can send out emails - Postfix, Dovecot, Webmin/Virtualmin

I'm using CentOS with Postfix, Dovecot, Webmin/Virtualmin. I can't seem to receive emails for all addresses for one of our virtual servers configured via Webmin/Virtualmin. But I can send out (and it ...
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Postfix Dovecot Pi server cant connect to email client even though it can send and receive emails

I followed the sam hobbs tutorial for setting up a postfix dovecot email server on a pi and with quite a bit of research and trouble i got my pi server running (can send and receive emails), but i ...
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254 views

postfix in docker cannot resolve hostname of relay host

My postfix instance running in a docker container seems to be unable to resolve the hostname of my relay which is outbound.mailhop.org (formerly Oracle and now owned by DuoCircle). Relay fails with ...
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182 views

Roundcube issues after server upgrade (Debian 10, PHP7)

I have upgraded my DigitalOcean droplet from Debian 8 to Debian 10, as well as upgraded PHP from PHP5 to PHP7.3. I also upgrade RoundCube to 1.4.2. Everything seems to work fine. I see no obvious ...
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How can i view mail using doveadm?

I have mail sent to my dovecot inbox and I can see that there are unread emails. If I run: doveadm -f table mailbox status -u bob all INBOX I get: mailbox messages recent uidnext uidvalidity unseen ...
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postfix on the cloud without mydomain

I'm trying to make postfix server on a cluster (docker swarm). The postfix main.cf configuration needs mydomain but I'm not using a dedicated machine to domain name. I have 10 machines and 6 domains. ...
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postfix running but not accessible

I've got postfix running (or so it seems) on my Debian 10 system: user@leah ~ # service postfix status ● postfix.service - Postfix Mail Transport Agent Loaded: loaded (/lib/systemd/system/postfix....
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Postfix + Cyrus not working

I have a problem. I have configured postfix for run with cyrus, and it's still not working. /var/log/mail.log Nov 29 10:44:24 mail postfix/submission/smtpd[32229]: connect from out.example.com[xxx....
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bash: printf to email Fails, Redirect Succeeds

When I pipe the output from printf to mail, the email does not get sent. When I write the output to a file and redirect input from the file, it works. e.g. I have a bash script with the following: ...
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972 views

Relay access denied with postfix when receiving mail

Introduction I recently installed postfix 3.3.0 on an Ubuntu 18.04.3 LTS virtual machine. To test the installation, I am using out-of-the-box configuration, which means I did not change anything yet....
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what's the difference between using RBLs and anti-spam software?

My doubt is, is it too different to use RBLs instead of anti-spam programs? (like SpamAssassin) I've a Postfix + Dovecot server with some RBLs in Postfix, and disabled SpamAssassin because it was ...
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Postfix is forwarding/relaying spam

I have an Ubuntu 16.04 machine with Postfix 3.1.0 and virtual mailboxes (iredmail). I'm using postscreen (with a local Bind server), Amavis with ClamAV and SpamAssassin. The amount of received spam ...
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Linux Mint Postfix connection refused

I'm trying to create a server on Linux Mint (Cinnamon 19.2) for HTTP (Apache2, Mysql5.7, PHP7.2), FTP, and Email (Postfix, and evetually Dovecot and SquirrelMail or RoundCube, but after I get Postfix ...
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500 views

Make postfix use sasl / auth plain for outbound mail to a relay server

My postfix does not send AUTH PLAIN to the outgoing relay server. It must have worked a couple of days ago, but now I get "relay not permitted" bounce mails. The mail system runs in an Alpine Linux ...
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433 views

Postfix issue on Ubuntu (Amazon EC2): can not send email after a few success

I installed Posifx on Ubuntu 18.4 LT on an amazon EC2 box. After installation and configuration, I was able to send out two emails to my hotmail and another email account. I do received them. However, ...
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133 views

Postfix/Dovecot mailserver with neomutt

I set up a mailserver on Archlinux with Dovecot and Postfix. I setup a Domain including SSL, MX records, DMARC etc. Everything works fine except that I have trouble using it in Neomutt. To add the ...
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977 views

How connect Dovecot with Postfix in docker-compose

I made mail server with this tutorial. Everything works, but I want to put mysql, postfix and dovecot in containers. I used mysql image. I made Postfix container for my own. I have no problem ...
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370 views

SMTP Open Mail Relay vulnerability

I have to check if my server (SUSE 11) is used as an SMTP Open Mail Relay and, if so, block this unwanted feature. I check /etc/postfix/main.cf and all relay's related variables are commented : #...
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249 views

postfix stopped working after fail2ban

Since yesterday my Postfix stopped working: It doesn't receive any e-mails anymore (from other email addresses, not my own). There's nothing in mail.log or mail.err. Yesterday I installed fail2ban on ...
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285 views

postfix smtp server initial server greeting error

I've installed postfix in centos and attempted to send an email but I get the error 'Lost connection while receiving the initial server greeting'. The error occurs with gmail, hotmail and my work ...
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216 views

Postfix: how to stop postfix or Ubuntu sending emails to Gmail and getting a 421-4.7.0 error

I have an Linux server (Ubuntu) in which, while setting it up, I entered my gmail address. So now, each 5 or 6 minutes, gmail servers respond to my server with the following message (appearing in the ...
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207 views

General type of Postfix mail configuration

During Postfix installation I configured General type of mail configuration. How check this configuration after intallation?
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Postfix flush changes messages date

I'm using postfix with dovecot as smtp/imap server stack. Quotas are configured in dovecot for users, but i'm facing a date problem: When messages are kept in postfix queue, frequently cause of imap ...
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148 views

Postfix Header_Checks Reject Legitimate Mail (CnetOS 7 + Postfix 2.10.1)

I use Postfix to block terms in headers and bodies. In few cases, it blocks legitimate mails because the term used is present in a long string (probably an id or reference or a coded string). For ...
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Showing postfix settings on linux

I wanted to see if anyone else knew the answer to this as my googlefu is failing today. I am trying to see the configured settings on a linux/centos server running postfix for it's email usage. I ...
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977 views

Adding custom schema to openldap

I want to setup my postfix with ldap authentication. I follow this tutorial https://blog.tnyc.me/postfix-with-ldap I need to setup a PostfixBookMailAccount but therefore i need to load that schema. I ...
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479 views

Postfix setup for Raspberry Pi 3B+ (non-dedicated mail server, fantasy FQDN)

Problem: Create a contact form that lets users of a website submit messages that are sent to an email. Use php's mail() and Postfix. Having trouble using/understanding Postfix? The setup must be ...
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attack via executable line after plus sign in email address

I operate my own mail server and from time to time, people send spam or mysterious stuff to the root account. Recently, I got an empty mail, which was addressed to: root+${run{x2Fbinx2Fsht-...
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Mail is not working on debian server - Outgoing SMTP “Connection timed out”

I have Debian 8 VPS and websites running on PHP 5.6, using Cloudflare DNS servers. I tried to install sendmail and postfix, but sending mails is not working, even through the CLI. I can see syslog I ...
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562 views

Does a cert's filename matter?

Our product is running postfix and nginx as docker services. We initially deploy with a self-signed cert that is named <our-company>.com.cert along with a .pem and .key. These are mounted as a ...
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1k views

postfix virtual_alias_maps map lookup failed [fixed]

Running postfix on archlinux with virtual user configuration, I get the following error message: postfix/cleanup[17859]: warning: 1C0F715008: virtual_alias_maps map lookup problem for < ...

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