Questions tagged [opendmarc]

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Postfix/Postgrey/openDMARC: Bypass greylisting if DMARC check succeeds

I have set up Postfix so that it is using Amavis (in conjunction with Spamassassin and ClamAV), openSPF, openDKIM, and Postgrey, and I have recently added openDMARC to the configuration. All of them ...
0 votes
1 answer
109 views

OpenDKIM & OpenDMARC on SLES 15 SP2

Hello is it possible to install OpenDKIM & OpenDMARC on SLES 15 SP2 through the default repository of OpenSUSE?
1 vote
1 answer
2k views

OpenDMARC RFC5322 requirement error: not exactly one Date field

I've set up an email server for my business, and everything is working fine as long as the email addresses are accessed through Thunderbird. I've got an employee that has a license for Outlook that ...
0 votes
2 answers
240 views

How to tell opendmarc to stop using opendmarc-import?

I'm running opendmarc with postfix under Debian linux. I did the standard Debian apt-based install of opendmarc, but later, I realized that it is apparenly configured by default to make use of ...
8 votes
2 answers
2k views

DMARC test failed but we didn't find any obvious reason why; DMARC not passing while SPF and DKIM do

About 7 days ago, I found out on https://www.mail-tester.com that sometimes (50% of my tries over a couple of days) my company email does not pass DMARC test. As it states it does not know why, I am ...
1 vote
1 answer
371 views

Postfix (SASL) and OpenDMARC-Reports

I am after suggestions on how to implement email sending of OpenDMARC-Reports. The problem I am having, is that (for obvious reasons), I have implemented SASL authentication on the smtpd server for ...
1 vote
1 answer
790 views

Why is opendmarc SPF failing this arriving message?

Why is this incoming message failing? postfix/smtpd[4776]: connect from mail-mw2nam10on2073.outbound.protection.outlook.com[40.107.94.73] postfix/smtpd[4776]: Anonymous TLS connection established ...
-2 votes
1 answer
780 views

My OpenDMARC is rejecting emails from firefox.com . Is their SPF record correct? Or am I wrong?

Why is opendmarc rejecting mail from firefox.com? It looks like their SPF record matches their sending address and does pass: v=spf1 mx a include:amazonses.com include:mail.zendesk.com -all /var/log/...
3 votes
0 answers
222 views

Using DMARC techniques to block Backscatter

We run a small email (receiving not bulk sending) service (~ 300 domains or so) for our customers and are just starting to introduce DMARC. One of the reasons for doing so is to help stop backscatter ...
1 vote
1 answer
267 views

How to install opendmarc on Debian Wheezy

How can I install opendmarc on Debian Wheezy? I have tried: ~ $ echo 'deb http://ftp.debian.org/debian wheezy-backports main contrib' >> /etc/apt/sources.list ~ $ apt-get update ~ $ apt-get ...