DKIM fail for internal email
Posted: Mon Jul 08, 2019 1:16 pm
Hi folks,
When checking my DMARC set-up and poking through email headers, I noticed this:
Authentication-Results: mail.blahblah.co.uk (amavisd-new); dkim=neutral
reason="invalid (public key: OpenSSL error: too long)"
header.d=blahblah.co.uk
It was an email to me from another user on the same server and my server is set to use the default 2048bit key length.
[root@mail ~]# openssl version -v
OpenSSL 1.0.2k-fips 26 Jan 2017
Using Centos7
If I look at the headers of an email I sent to a webmail account (yahoo) I see a DKIM pass. I'm a little concerned as I'm trying very hard to block phishing emails that are pretending to come from our own domain and I was hoping that DKIM/DMARC would help with this.
Any clues for the clueless?
When checking my DMARC set-up and poking through email headers, I noticed this:
Authentication-Results: mail.blahblah.co.uk (amavisd-new); dkim=neutral
reason="invalid (public key: OpenSSL error: too long)"
header.d=blahblah.co.uk
It was an email to me from another user on the same server and my server is set to use the default 2048bit key length.
[root@mail ~]# openssl version -v
OpenSSL 1.0.2k-fips 26 Jan 2017
Using Centos7
If I look at the headers of an email I sent to a webmail account (yahoo) I see a DKIM pass. I'm a little concerned as I'm trying very hard to block phishing emails that are pretending to come from our own domain and I was hoping that DKIM/DMARC would help with this.
Any clues for the clueless?