Questions tagged [postfix]
Free and open source mail transfer agent (MTA) that routes and delivers email. When asking about postfix problem, please include the relevant maillog lines and output of the following command: `postconf -n` (non-default content of main.cf) and `postconf -M` (content of master.cf)
6,684 questions
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1 answer
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How to configure Postfix for multiple sending options
I am installing on a Debian 12 server running Apache2 and PHP. I installed Postfix, and now I get the following configuration screen: No configuration: Should be chosen to leave the current ...
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Courier and Postfix can't write to filesystem after upgrading Debian stable
I have been using Postfix + Postfixadmin + Dovecot for a long time. So, I upgraded my Debian stable system. Since Dovecot introduced incompatible donfig changes in the latest version (and I really don'...
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1 vote
1 answer
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`testsaslauthd` working but SASL authentication fails in Postfix when upgrading Debian Bullseye -> Trixie
I am upgrading a postfix email server from Debian Bullseye to Trixie. The server is using saslauthd which is using the /etc/shadow file for authentication. The issue: a Ruby on Rails application that ...
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0 votes
0 answers
36 views
Postfix Server Error NOQUEUE: reject: RCPT from
As a bit of background I'm using postfix to receive mail for multiple users after Fasthosts have performed mail forwarding for the original receiving domain. For example: [email protected] ->...
1 vote
1 answer
120 views
Postfix relay to AWS SES failing when root is aliased due to "Transaction failed: Domain contains illegal character"
I registered [email protected] (placeholder) in AWS SES to send email from a Debian 13 box. Both the sender and the recipient's address are set to [email protected], i.e. mail from foobar@example....
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2 votes
1 answer
215 views
Dovecot cannot find virtual user from Postfix
I am setting up a Postfix + Dovecot mail server. I have a handful of virtual aliases all mapping to a single Unix user, vmail. I set this up in Postfix main.cf: virtual_alias_domains = example.net ...
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1 vote
0 answers
126 views
Intermittent nameserver (DNS lookup) failure using postfix/dovecot [closed]
Several months ago I reconfigured my server to dispense with PLESK (I never really used it, it was required by the server service, when they were bought out they didn't care anymore and it was ...
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1 vote
0 answers
58 views
A specific entry in smtp_generic_maps is messing up mail delivery
There is SMTP configured on Postfix for local domain (local_domain). All outgoing emails should go through external SMTP relay with proper MAIL FROM, and From header. Only sender in permitted form foo@...
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1 vote
1 answer
103 views
Postfix multihome not sending from IPv4
I've a server with both IPv4 and IPv6 interfaces. Postfix is multihome, one instance, named postfix, is IPv6 only, and another, named postfix-kupec, is ipv4 and ipv6. Here's an output from postconf: ...
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2 votes
0 answers
84 views
X-Postfix; User unknown in virtual alias table
I'm at my wits end trying to track down what is causing the error mentioned in the title. I have a server running Debian 11 (due for an upgrade to 13 soon.) and Postfix 3.25 which is run chrooted. ...
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39 views
dovecot used with redmine to retrieve email, stale mail still sitting in redmine's mailbox. How to force read?
I have a redmine server running under ubuntu 24.04 on a GCE VM with a postfix mail server set up. I was/am having trouble using the "pipe to postfix" method for retrieving email replies ...
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1 vote
0 answers
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Postfix/Dovecot: Multiple auth mechanisms
I do have a server with dovecot and postfix. Postfix forwards the authentication to dovecot via smtpd_sasl_type = dovecot In dovecot I am using a passwd-file. Unfortunately the auth_mechanisms of my ...
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67 views
Rspamd is not signing DKIM for my mail server
I've created a self hosted mail server for myself. I've setup and configure. All the things and also the dns records. POSTFIX and DOVECOT is working with SASL and TLS. And mails are also received by ...
2 votes
0 answers
62 views
Where does dovecot store emails on disk?
I have a dovecot + postfix + postgres working mail server. But I am failling to locate where incoming emails are stored on disk (to adjust my backup scripts). I have configured them to go to /var/...
2 votes
1 answer
327 views
Dovecot login rejected with password having illegal chars
I am setting up a new mail server. I can send/receive email from the command line. But I cannot get local users to login via dovecot root@mydomain:# doveadm auth test [email protected] Password: ...
0 votes
0 answers
66 views
Postfix restricted domain routing for ip ranges
I am configuring Postfix on a Rocky 9 internal mail relay server for my company. The general requirements are to allow any internal system to send to any internal address, which I am doing via the ...
0 votes
1 answer
98 views
Configure Alfresco Community Edition outbound mail to use Postfix
I configured Postfix on a VPS to use a relay service to send mail. My challenge is how to configure Alfresco to connect to Postfix to send mail? It is not sending mails. Below are the parameters in ...
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43 views
Postfix recipient bcc if not from a certain sender
I currently bcc recipients as per the setup below and all works fine but my recipient_bcc sends a copy from a sender address ([email protected]) when sent to the first recipient which I don't need. ...
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0 answers
30 views
Postfix not respecting message_size_limit [duplicate]
I am receiving the following error on Outlook 2024 when sending "large" attachments to my mail server, which is running Postfix 3.3.1: 552 5.3.4 Error: message file too big Through trial ...
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45 views
Mailcow (Docker) – How can I log the Subject header in Postfix logs?
I’m running Mailcow on an Ubuntu server using docker-compose. The stack works fine, but for troubleshooting purposes I’d like to see the Subject of each email in the Postfix logs. Currently, when I ...
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1 vote
0 answers
41 views
Centos 7, Postfix - Outbound (smtp) Untrusted TLS connection [closed]
I have a Centos 7 server that I'm having trouble clearing the smtp warning for outbound mail. I get: Untrusted TLS connection established to... [any domain] I am using letsencrypt. I have searched ...
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0 votes
1 answer
113 views
Why does postfix send automatic "sender delivery notifications"?
I maintain my own postfix server for my email account. Nobody else uses this server to send email. I received a DMARC aggregate report indicating a rejected delivery to a domain to which I did not ...
user1298242
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40 views
Deliver local mail locally using Outlook 2021 client
I would like to support using the Outlook 2021 thick client to sent local mail locally (i.e., without off-site relaying). I setup an Ubuntu 24LTS VM and installed postfix and dovecot. I tested the ...
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46 views
Problems with Postfix, ssl-tools.net says No connection to the mailservers of mail.webcam-team.de could be established
My private ssl runs out of date and I made a new certificate with lets encrypt. Now I got this error at ssl-tools.net: No connection to the mailservers of mail.webcam-team.de could be established. i ...
0 votes
1 answer
104 views
Postfix not using smtp_bind_address6 for sending
I've got Postfix running on a Ubuntu 22.04 box. The box has several IPv6 addresses, including a:b:c::2 and a:b:c::25. I want Postfix to use a:b:c::25 for sending messages. a:b:c::25 has a PTR record ...
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1 vote
2 answers
187 views
Spamhaus Error: excess volume in Postfix. False positive. Stuck
I am having this weird Postfix issue with Spamhaus excess volume error. First off I checked what the error suggested to check here I followed the instructions and changed my configuration as follows: ...
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27 views
How do I filter a postfix relay's log for some mail rejected by others?
I want to see when this is happening, rather than have to dig through thousands of lines of logs and never notice it before senders complain, and want to know if some tool already exists where I can ...
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0 votes
0 answers
71 views
Postfix stops creating log when syslog reload
I am facing an issue in my server. Sometime syslog auto restart. But after auto restart postfix is not create any logs. When restart postfix manually then it will work. How to solve this issue. root@...
0 votes
1 answer
119 views
Postfix SMTP relay - domain allowlist for specific sending hosts
Fairly new to Postfix. I have Postfix setup for SMTP relay to Office365 and we are needing to set specific internal hosts to only email specific domains, e.g. server1 --> example.com only. Deny ...
0 votes
0 answers
30 views
Postfix as relay to scaleway generate rejected messages back to my server
I've got a postfix server running at home which relays outgoing email via scaleway. I've got the domains, SPF, DKIM and all that set up. I'm not having a problem with getting my emails delivered. I've ...
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60 views
Email error 550 JunkMail rejected [duplicate]
When we send email to some clients, we get this message back: Jun 5 16:21:28 MyDomain postfix/smtp[1589281]: 1XXXXX8D6B3: to=<[email protected]>, relay=MyClient.com.br[yyy.yyy.yyy.yyy]:25, ...
0 votes
1 answer
39 views
postfix still sends to local account disabled by access map when another user's .forward file or alias references it
I moved from an old sendmail based mail server to a new Postfix one recently. On the old system when a user account was closed I would put an entry in a access map for sendmail like To:olduser@ ...
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0 votes
2 answers
151 views
Postfix - is it worth adding lots of reject_rbl_client in smtpd_client_restrictions?
I am just getting used to postfix after using sendmail for decades. We have a new server with postfix 3.5.25-1.el9 installed. The server is new and I threw in a treasure trove of RBLs for preventing ...
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71 views
Astersik + FreePBX SMTP settings for voicemail
We inherited an Asterisk with FreePBX. From log files I can see, that it is trying to send voicemail notifications through certain smtp server. Also, with some rsearch I've found that Astersik is ...
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246 views
How can I solve POSTFIX SASL Invalid authentication mechanism error while sending emails from Outlook?
I have a problem with my Postfix/Dovecot mail server authentication when using a mail client such as Outlook. I can add an account to the client app, and it is successful connecting to the Inbox, but ...
0 votes
1 answer
94 views
Debian Mail server + Rspamd not sending or receiving mails anymore. Maybe Spamhaus issue?
my debian mailserver currently does not send and receive any more mails and I am not really finding out whats the problem. I am running debian 12 (bookworm) (previously upgraded from an older debian ...
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IMAP clients don't see mail: Postfix delivers in a different path from the one read by Dovecot (SQL Backend)
I'm setting up a business mail server on Ubuntu 22.04, following the LinuxBabe reference guide : https://www.linuxbabe.com/mail-server/setup-basic-postfix-mail-sever-ubuntu ✅ Stack technique : ...
0 votes
1 answer
100 views
Making a new port on Postfix that allows non authenticated access?
I have a Postfix server that allows autenticated access thru Dovecot to send emails thru ports 25 and 587. That works great. We have a application that does NOT support authentication so it currently ...
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1 vote
1 answer
95 views
Postfix smtp_bind_address with additional IP addresses
I am running a Debian 12 server with two additional IP addresses that I want to use for sending emails through my SMTP server. The main IP address of the server works perfectly for sending and ...
0 votes
1 answer
96 views
Which Linux commands report via E-mail? [closed]
Which daemons in a linux server will benefit from a working MTA? cron may send a report with the results and/or the errors if MAILTO is defined to at least one valid email address. smartd may report ...
3 votes
2 answers
184 views
In default Postfix "master.cf", why is "smtpd_reject_unlisted_recipient" set to "no" for submission?
In the default /etc/postfix/master.cf (for Ubuntu 24.04 LTS, at least), it has this commented out section for submission: #submission inet n - y - - smtpd # -o ...
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0 votes
1 answer
95 views
Initial delay upon SMTP connection to Postfix
I'm seeing a 5 to 6 second delay when an SMTP connection comes in to Postfix, that I think might be associated with either the reverse DNS verification or else establishing the SSL/TLS connection (or ...
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0 answers
49 views
OpenDMARC is rejecting valid spf record include:
I'm running postfix and I'm having emails rejected by opendmarc that appear to be valid. Here is an example: Apr 9 17:51:40 primary postfix/smtpd[517925]: D4FAB20161: client=lg95.mta.exacttarget.com[...
1 vote
0 answers
63 views
Amavis not tagging emails with X-Spam headers on one server (works on another with same config)
I have two CWP servers running Amavis + SpamAssassin + Postfix, both with almost identical configurations: CWPpro 0.9.8.1201 on AlmaLinux 8.10 Same versions: amavis 2.13.1, SpamAssassin 3.4.6 main.cf, ...
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51 views
Need help to config hold external ougoing mail and admin approve later (ubuntu, postfix, dovecot, modoboa webmail)
I'm deploying an internal mail system using Modoboa on Ubuntu 24.04 with: Postfix + Dovecot + PostgreSQL Modoboa installed using the official auto-install script SPF, DKIM, DMARC, Let's Encrypt SSL ...
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0 votes
1 answer
79 views
How does one get the mailer-daemon to copy the bounced email report to an email address?
When a client contacts me to report a recipient is receiving a bounced email "Undelivered Mail Returned to Sender", I ask them to kindly get the recipient to forward me the bounced email ...
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1 answer
85 views
PostFix + Dovecot can't find user
I am getting the below error after installing the Postfix following this article. 2025-04-14T00:46:18.494081+00:00 mail postfix/lmtp[29381]: 5436D7EADB: to=<[email protected]>, relay=mail.example....
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2 votes
0 answers
328 views
How do I configure Postfix as the smart host
I have a postfix server configured to send mail to a smarthost. It is successfully authenticating with that smarthost which is another postfix server. The receiving postfix servers has: ...
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1 answer
85 views
Sending postfix mail to specific port on same machine
I have a mailserver running in a docker container (named "mailserver") at port 25, connected to the host (192.168.111.111) at port 25. Devices on my network can send mail to 192.168.111.111:...
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276 views
Best way to collect detailed mail server statistics (Postfix)?
I'm managing a Postfix mail server and looking for a robust and privacy-conscious way to collect detailed statistics for system-wide dashboards. I want to track metrics such as: Number of sent/...
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