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)
6,686 questions
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Receiving spam with my own forwarding address as the sender (from)
The scenario is simple. I have a virtual address (I'll call it [email protected]) that receives external messages and forwards them to an authenticated email inbox. So far, so good. The problem is ...
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Solve email server reputation from relays / form submissions
I run a postfix server with email accounts for each user. Users can use their credentials to send emails, which is the main use-case. But the server is also used to forward emails if the user wishes, ...
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Postfix reverse DNS fails with DNSSEC resolver when there's a lame `in-addr.arpa` DNS zone delegation
I'm running Postfix 3.10 on an Ubuntu 24.04 server, with these settings in /etc/postfix/main.cf:
smtpd_client_restrictions =
# previous entries omitted for brevity
warn_if_reject ...
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How to retire wildcard mailbox aliases (sub-addresses) in postfix, without root
I run a postfix/dovecot mail server. It is configured for automatic delimiter-based aliases, so things like [email protected] or [email protected] all end up delivered to username.
That's ...
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How to configure health-check for Postfix behind HAProxy when using the proxy-protocol
I have a Postfix Backend behind HAProxy and check for a response starting with 220 (status code).
backend smtp-backend
mode tcp
option tcp-check
tcp-check expect rstring ^220
...
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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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40
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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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`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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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] ->...
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1
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133
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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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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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133
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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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59
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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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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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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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