FILTER-DKIMSIGN(8) System Manager's Manual FILTER-DKIMSIGN(8) (NAME) filter-dkimsign - DKIM (SYNOPSIS) filter-dkimsign [-tz] [-a algorithm] [-c canonicalization] [-h headers] [-x seconds] -d domain -D file -k file -s selector (DESCRIPTION) filter-dkimsign DKIM . : -a algorithm . rsa ed25519 ( ). sha256 . rsa-sha256 . -c canonicalization (canonicalization) . simple/simple . -D file . . -d . -d domain . domain . from . (domain) . domain . -h headers . RFC from . (:) . from:reply-to:subject:date:to:cc:resent-date:resent-from:resent-to:resent-cc:in-reply-to:references:list-id:list-help:list-unsubscribe:list-subscribe:list-post:list-owner:list-archive. -k file RSA . -s selector (selector) _domainkey domain . -t dkim. -x seconds ( ) dkim. -z dkim dkim. -z dkim . . (SEE ALSO) smtpd(8) (STANDARDS) D. Crocker, Ed., T. Hansen, Ed., and M. Kucherawy, Ed., DomainKeys Identified Mail (DKIM) Signatures, RFC 6376, Brandenburg InternetWorking, AT&T Laboratories, and Cloudmark, September 2011. J. Levine, A New Cryptographic Signature Method for DomainKeys Identified Mail, RFC 8463, Taughannock Networks, September 2018. (AUTHORS) Martijn van Duren Linux 6.15.2-arch1-1 June 24, 2025 FILTER-DKIMSIGN(8)