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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.

6398 questions
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Postfix Failed to start : unable to set exclusive lock: Resource temporarily unavailable

Postfix was running well untill I decided for some reason to restart since I updated message_size_limit By doing this postconf -e message_size_limit=24840000 Stopped it and Now ... Postfix wont start , It keeps on saying fatal: open lock file…
Fahad
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"NOQUEUE: reject: RCPT from thridparty.mailserver: 554 5.7.1 Relay access denied"

I have recently upgraded my production server (Ubuntu 15 to Ubuntu 16.04.1). Before the upgrade, I've follow this tutorial for configuring Dovecot/Postfix and Vimbadmin. Now, i can send succefully email but it's not possible to receive any e-mail. I…
Shinix
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How to stop Postfix from forwarding SPAM without blocking local users' SPAM?

Some of my users have aliases in /etc/postfix/virtual that forward to other providers (mostly gmail). I believe that the fact that all mail is forwarded (even SPAM) is causing reputation issues for my IP. How can I block forwarding of mail that…
singpolyma
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How to disable sorbs in spamassassin

I notice that sorbs.net is marking GMail's IP as spam sender which causes my users not able to receive from gmail.com. I want to disable or remove sorbs.net from checking process or add more DNSBLs in order let gmail emails in. I tried adding the…
undone
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SPAM because of a unsuccesful SPF validation

I have a public mail server (Linux + postfix) and some clients using it. The server is properly configured, included DKIM and SPF validation. But emails from only a few of my clients are being marked as SPAM, because the client-ip doesn't match with…
ABu
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Postfix sometimes deliver emails and sometimes not

Im using postfix 2.3.3 on RHE5, since some weeks ago, we had an email delivering issue, being specific with external relay (gmail, hotmail, yahoo). I made some exercises: send one email to an internal email address with CC external address. We…
Willy Peitzner
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postfix - allow sending email with related alias

I have installed postfix 2.11.3 + +sasl + postfixadmin + dovecot + roundcube on debian 8. All is working fine but today every users can send email with another email address. I would like to add a restriction to allow the users to send email only…
hrvz
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Rewrite Email Subject

Is there a way to rewrite a subject of an Email on the receiving MTA (presumably at the Spam Filtering stage). An example would be if giving Email accounts to young children where certain words need to be blocked/X'd out (Profanity, etc.). Currently…
yayim
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How to configure postfix to receive mails and keep them in queue but not sending them out

How to configure postfix to only receive mails and put them into local queue but not actually forwarding mails so they keep inside /var/spool/postfix
frlan
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Strange hack attempt to postfix

Yesterday I got a email sent {@DOMAIN.ORG from my mailserver the mail was marked as spam. The body included scripts download commands like ftp://ftp.ugotownedz.org/upfile2.sh lines from syslog Aug 14 19:25:00 hoeschen-vserv postfix/smtpd[20965]:…
RubbelDeCatc
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Postfix is not responding on port 465 (SMTPS)

I have Postfix and I've configured it to listen on port 465 for SMTPS. When I telnet to port 465, it does not respond but it does respond on port 25. I've googled for days and nothing has worked for me so far; so now I am coming for some help.…
Matthew
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Why is REDIRECT header_check creating a CC

I configured Postfix with a custom before-queue filter script (fuglu) which inspects every incoming email first, and then adds the following header: X-Fuglu-Test: Test Email In postfix, I configured a header check to redirect email matching header…
postfixrising
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System reboot results in T_DKIM_INVALID spamassassin

I have installed and configured OpenDKIM in my Ubuntu 16.04 digitalocean vps and enabled the DKIM Plugin in SpamAssassin with loadplugin Mail::SpamAssassin::Plugin::DKIM in one of the .pre files located in /etc/spamassassin/ I have also installed…
Phoenix Aspacio
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OpenSSL No Client Certificate Presented (SMTP, Postfix)

I used OpenSSL to create a private key and self-signed public certificate. I then created a Certificate Authority file that contains both the private key and public certificate (mail.example.com.pem). On a client computer in the LAN, I use OpenSSL…
JeremyCanfield
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Email address tagging doesn't work with virtual mailboxes in postfix

I have my own email server, and I'd like to be able to use dynamic email address tagging. I added the recipient_delimiter = +- directive to my config and restarted postfix, but now if I email bob+sometaghere@starbeamrainbowlabs.com for example, the…
starbeamrainbowlabs
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