Amavisd-new and DKIM

Currently I’m playing around with amavisd-new and amavis-milter. Trying to analyse a maybe-bug I temporarily disabled DKIM signing. Then I had the glory idea to send an E-Mail to the amavis maillinglist. It sort of caused some mail reporting storm back to me. In this article I’ll show you, how you can configure amavisd-new to do DKIM verification and DKIM signing. But first, here’s one of those reports:

Continue reading Amavisd-new and DKIM


What is MTA-STS (MTA Strict Transport Security) about?

MTA-STS basically enforces TLS for your mail communication, similar to HTTP Strict Transport Security (HSTS) for HTTP/HTTPS traffic. By telling the sender that TLS has to be used one can reduce / stop Man-in-the-Middle (MITM) attacks. A probably better explanation is found in the abstract of the RFC:

Continue reading Setup MTA-STS and TLSRPT