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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)

Postfix is a mail transfer agent (MTA) that supports IPv6, DNSBL, SMTP AUTH (SASL), TLS and various database backend.

Postfix was written by Wietse Venema in 1997 and first released in December 1998 as IBM Secure Mailer.

It was designed to be highly secure and configurable, and is a drop-in replacement for , with much simpler configuration syntax.

The software was also formerly known as VMailer.

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postfix: Host or domain name not found for name=comcast.net Type=A: Host found but no data record of requested type

I have set up an ISPConfig server to host email for several domains and I am having a problem with mail sent from this server not being delivered to some, but not all, valid domains. When mail is rejected, it contains an error message similar to the…
Jeff Leonard
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Prevent postfix from trying secondary MX after soft bounce from Google MX servers

My local SMTP relay is finding it increasingly difficult to deliver mail to my G-Suite groups and users. The volume is not very high, but Google enforces rather low limits on incoming e-mail from external sources. Something like 180 per 20 minutes…
Roy
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Prevent Postfix dispatching email over wrong network interface

I have a Postfix mail server, running on a host with multiple network adapters, one of which is a virtual tun0 device. I need this mail server to accept connections on any adapter - and send email only on the virtual tun device. I have a…
aSteve
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Postfix : Rate limit outgoing mail by mx of recipient and sender

Been learning Postfix and trying to setup my own mail queue server for newsletters (no mailchimp or sendgrid). I'm stuck on the last thing I wanted to implement, which is delays/queue. I found a tutorial on how to rate limit here :…
Darius
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Force postfix to send local mail through internet

I am testing a setup with gsuite where the desired outcome is that Postfix keeps mailboxes for all accounts (those that use gsuite and some that don't). Postfix should also be able to send out emails. The MX records point to gsuite and emails are…
joidegn
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Postfix, virtual aliases and UTF8

The Postfix documentation reads By default, Postfix sets the "SMTPUTF8 requested" flag only on address verification probes and on Postfix sendmail submissions that contain UTF-8 in the sender address, UTF-8 in a recipient address, or UTF-8 in a…
user178826
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How to turn on Postfix to always send DSN for authenticated senders?

There is a problem with Mail program on MacOS. It hasn't option to ask for Delivery Notification (for example, inform that email was accepted by email server of recepient) and DSN messages never comes in answer to emails from Mail (on MacOS). Very…
Marvin
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Postfix says "550 Address unknown", but check via telnet finds the address

I'm trying to send an email through Postfix from mydomain.com to an address I know exists (info@example.org). Postfix is reporting though that the address does not exist. Excerpt from mail.log Jun 7 07:01:47 mydomain postfix/smtp[50352]:…
herrherr
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Postfix disable error email notifications

I'm trying to disable Postfix error email notifications. I do not want to receive notification emails whenever a "User is unknown in virtual mailbox table". I still want to receive bounce notifications. main.cf : notify_classes =…
Brian Smith
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Postfix sasl relay host - failure

I'm trying to set up SASL to a relayhost to send external email. I've read a hell of a lot and done everything I'm supposed to have done. However our provider won't accept me relaying emails with (we are not on their network, but they say this is ok…
Mr Shoubs
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Postfix: after address rewriting (using aliases LDAP) rewrite 'To' header

we want to implement in our LDAP a sort of 'address book' and use Postfix to modify outgoing e-mails to use these aliases. The idea is that when a user writes to customer1@ourdomain.tld, the LDAP query retrieves e-mails (external or internal) and…
daks
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postfix not working correctly after system upgrade (no SASL authentication mechanism)

I had a working postfix/dovecot configuration running on a Ubuntu Server machine 14.04 LTS. Then I made a upgrade to 16.04.2 using do-release-upgrade. Everything seemed to work besides my mail service. Before the update everything worked but now I…
C0dR
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Stop postfix from sending non-delivery notifications when forwarded mail bounces

Some of my mail users are forwarding their mails to gmail for example. In some cases my Amavis lets some spam messages slip through. These mails are then bounced by gmail as they are spam. My postfix then tries to send non-delivery notifications to…
Hokascha
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Postfix - recipient_delimiter to mail folder

I am using postfix, the LDA is dovecot and i found the useful parameter recipient_delimiter in the man page of postfix. I would like to use mail addresses like user+folder@domain.com and the mail server should automatically move the mail into the…
user2933212
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Blocking empty subject line emails from being sent or received?

How can I configure Postfix, Dovecot, and/or SpamAssasin to reject all incoming and outgoing emails with empty subject line emails? I am running on a Debian 8.6.
KingsInnerSoul
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