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)

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Reduce daemon mailer information

I want to reduce the info that the Mailer Daemon Postfix contribute when my server can't delivery an email because don't exist an account. I have my template "bounce.cf.default" but below ...
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Make Postfix add “Authentication-Results” header to locally originated mail destined to local domain?

If I write via sendmail or SubmissionS client a mail to my virtual account (my domain is example.org), the mail I receive looks like this: Return-Path: <[email protected]> Delivered-To: [email protected]
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24 views

Different email addresses of same email server for sending and receiving

I am actually a fresher in terms of configuring an email server. Recently I configured a Postfix email server combining with dovecot and squirrelmail on AWS EC2 centos server, following this guide: ...
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Postfix - Tap all ingoing and outgoing mails and push to socket or script

I want to extend a new Postfix / Dovecot setup with virtual domains and virtual mailboxes (more or less everything in default configuration) by a simple, self-made email archival solution. Therefore I ...
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1answer
31 views

Configure postfix to send via IPV4 but receive using both IPV4 & IPV6?

Is it possible to configure postfix to send via IPV4 only but receive using both IPV4 & IPV6? My server, running on AWS Lightsail, now can have an IPV6 address. The address is relatively static (...
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21 views

Confusions regarding RSA certificates, TLS encryption, and virtual users when setting up a mail server

I'm currently trying to understand the process of creating a mail server by following this guide, among others. There are some parts I'm confused about. I will go through one by one. Before I start, I ...
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35 views

Blocking encrypted emails attachments with Amavis

I'm having a problem with amavis on my Centos 7 machine (amavisd-new 2.12.0, postfix 2.10.1, ISPConfig Version: 3.1dev). I'm trying to configure amavis so that it discards emails with encrypted .zip ...
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1answer
56 views

Postfix - relaying specific email addresses within a mydestination domain

Having some issues trying to get something working on postfix. That is, I have a domain abc.com which is a destination domain on my postfix server 1.2.3.4, it hosts mailboxes for addresses in this ...
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20 views

Which virtual alias concepts of Postfix can be migrated to Microsoft Exchange how?

My company uses some pretty basic Postfix setup, but makes heavily use of virtual aliases of different kinds. One example is using regular expressions to map special mail addresses of different test ...
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1answer
33 views

postfix does local delivery instead of via dovecot lmtp

Sieve isn't running on my system, and it looks like the reason why is that postfix is doing local maildir delivery instead of going through dovecot. Details: System: Ubuntu 20.10 /etc/postfix/main.cf: ...
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1answer
26 views

Postfix does not add to: header for outgoing mail

I have configured a basic Postfix setup to send mail using an external smtp relayhost, and resolving locally address mail via /etc/aliases. Sending email works (via the sendmail command) However, when ...
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1answer
47 views

OpenDKIM ignoring hostnames and domains in trusted hosts file

According to http://opendkim.org/opendkim.conf.5.html, the ExternalIgnoredHosts and InternalHosts options support the same format as the PeerList option as follows: The set should contain on each ...
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63 views

How to disable TLS_AES_128_GCM_SHA256 (or, how to set TLSv1.3 ciphers) in postfix

I have the following in my TLS configuration, but the only problem I have is that TLS_AES_128_GCM_SHA256 is a 128 bit cipher, and I would like to remove it: smtpd_tls_eecdh_grade = ultra ...
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2answers
73 views

Delivering smtp mail from postfix to exchange and online exchange problam

I have a very strange problem with one server01 its smtp notifications mail. My scenario: server01 sends mails over postfix to local on-prem exchange server. That mail is correct with to: address, ...
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68 views

Mailcow Postfix & MIMEDefang integration

I am running an Ubuntu 20.04 server. I have installed mailcow: dockerized as shown in their documentation which includes Postfix among other tools. The mail server itself works without a problem, but ...

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