Showing posts with the label opendkim

OpenDKIM on Debian: Skip that L= tag

A reader on the Mailop list pointed out that the Debian Linux wiki has a page for OpenDKIM and that this page can be interpreted as offering a suggestion to implement the "l=" option when signing messages with DKIM. I also think there's a typo in one bit (in the…

List-unsub-post in your DKIM configuration

I grant you that this is a niche one. Will this tip be helpful to millions? No….but. Hey, it's my blog. Anyway: Do you manage your own email sending platform? Is it a home grown thing? Maybe you’re using Postfix ? Or maybe you’re using the fancy commercial MTA Momentum ? Ei…

OpenDKIM and Postfix: Signing DKIM for multiple domains

How do I use OpenDKIM with multiple domain names on a single postfix server? That's a question I myself had when I first set up my current VPS to host my current email system. So I searched around a bit. I found  this guide , but it's kind of a pain in the rear. Too muc…

Is my DKIM key Insecure?

Various folks have been asking lately if their DKIM key might be "insecure." At least one ISP out there is failing working keys with "verification failed; insecure key" as the error. A number of small, second or third tier ISPs note that the DKIM validation …

OpenDKIM & SpamAssassin Gotchas on Ubuntu 12.04

Allow me to share with you my rough notes compiled during my recent configuration of email and DKIM on a new Ubuntu VPS installation. Hopefully these helpful hints will help the next poor soul trying to get DKIM up and running on the first try: SpamAssassin seems to want to fai…

Signing outbound list mail with OpenDKIM

For my server running the discussion mailing lists that I host, I'm running OpenDKIM, OpenDMARC and Postfix on Ubuntu. I run a custom mailing list manager that I wrote myself; I keep telling myself that eventually I'll polish the code enough to share it with the world. …