qmail SPF (Sender Policy Framework) patch
About This is an SPF implementation for qmail. SPF is something like a DNS based "reverse MX" system to designate permitted senders for mails depending on the domain name. The goal is to disallow sender address forgery. The patch is entirely written using the qmail string and DNS functions, and thus completely integrated into qmail without external dependencies. It can check incoming mails inside
DKIM and DomainKeys patch for qmail | Brandon's Blog
DomainKeys and its successor DomainKeys Identified Mail (DKIM) are technologies that allow organizations to take responsibility for a message. This is done by cryptographically signing an email as it leaves an organization in route to its destination. The signature can be verified using the DNS system to establish trust. In theory the technologies help cut down on spam by proving a message origina
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