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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 configure to use TLSv1.2

I start build my first cloud server: Ubuntu 16.04 with postfix. Question is how can i configure postfix to use TLSv1.2 when i send mail from my webshop? When my webshop sending mail to my postfix server it uses TLSv1 Here is…
John Steave
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Mail with DKIM Signature gets T_DKIM_INVALID flag by SpamAssassin

I've installed a Debian (jessie) box with postfix and spamassassin. Configured and everything works fine. Except receiving mails with DKIM signatur will produce a flag T_DKIM_INVALID even if the signature is valid. See log example below. After that,…
High Ball
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crontab sends month-old emails

ubuntu 14.04 Mailserver: Postfix root receives dozen of emails from crontab. These mails contain PHP warnings. I've fixed the cause for these warnings. I've fixed every cronjobs to not send emails (output sent to >/dev/null 2>&1) I've deleted all…
pixeline
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Reverse DNS is not a valid hostname

I help a friend run a server, which includes a mail server. http://mxtoolbox.com reports that our reverse DNS is not a valid hostname. The reverse DNS currently points to domain.com. Should it point to hostname.domain.com? I have seen here that it…
ConnorJC
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mail loops back to myself | postfix

Hi I have an issue with bounced mail it does not happen all the time but at the same time is very frequent. Most of the time if I send an email to an address that does not exist then i get a bounce back into failues@domain however there seem to be…
Alistair Prestidge
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Why are there so many files in /var/spool/postfix/maildrop

We have CentOS 7 running, and previously had postfix installed (it is currently uninstalled). After removing postfix we checked the /var/spool/postfix/maildrop, as the df -h command was reporting over 9GB of usage in that directory. There were…
Jarrett
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Roundcube & Postfix SMTP: SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca:s3_pkt.c

I have a Postfix / Dovecot / Roundcube setup that I use personally, as well as provide to other users. I am attempting to transfer this entire setup to a new box, but having some issues. Mail receiving is working fine, (only tested internally,…
1n5aN1aC
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GMail bouncing mail sent over IPv6, IPv4 working

I have trouble sending email to GMail addresses using IPv6 from my domain camgirltools.net If IPv4 is used, everything works as intended, the mail is delivered. When using IPv6 to send mail to GMail (other parties work) I get a bounce mail…
Johannes H.
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How widely supported is forced TLS on inbound SMTP connections?

I run an MTA consisting of the standard Postfix, SpamAssassin, ClamAV, SPF/DKIM checks etc. This MTA is used for inbound email only, doesn't host any accounts and forwards any mail that passes said checks to a shared webhost. I'm aware that a few…
Craig Watson
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Cannot send email to info@ or support@

I am trying to send email from my gmail account to a couple user accounts I have on my new Centos server. The email is setup correctly and I can send receive from accounts ok except info and support. I tried to setup two users "info" and "support" I…
Brian Curless
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Why is Google rejecting mails forwarded from my Postfix server?

I've set up Postfix and created an alias that maps to a gmail account. When I mail from one of my own (google mail) accounts, it goes through, but if someone from the outside mails me, Google won't accept the mail from my server. The logs something…
troelskn
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simple postfix configuration - forward all incoming email to single address

I've a Ubuntu 9.04 server installation which is hosting a small number of websites (currently two, and will remain in single figures). The email requirements for the server are very limited - to send outgoing emails and forward all incoming emails…
Cruachan
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How do I count the messages of Postfix's mailq?

How can I get number of messages count in Postfix's mailq? mailq command display entire mails in mailq but i would like to know count only.Is there any command for this. My OS is centos 5.5.
Sai Ye Yan Naing Aye
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How do I set up postfix to store e-mail in a file instead of relaying it?

I want to run a staging copy of a production server on a local environment. The system runs a PHP application, which sends e-mail to customers in various scenarios and I want to make sure no e-mail is ever sent from the staging environment. I can…
GomoX
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Why is Postfix trying to connect to other machines SMTP port 25?

I get these errors: Jul 5 11:09:25 relay postfix/smtp[3084]: connect to ab.xyz.com[10.41.0.101]:25: Connection refused Jul 5 11:09:25 relay postfix/smtp[3087]: connect to ab.xyz.com[10.41.0.247]:25: Connection refused Jul 5 11:09:25 relay…
TryTryAgain
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