Questa pagina riguarda la patch DKIM inclusa nella mia patch combinata (maggiori informazioni qui). Questo argomento è avanzato ed è consigliabile tornare qui alla fine del tutto.
DKIM fornisce un metodo per validare l'identità di un nome a dominio associato a un messaggio con una autenticazione crittografata. La tecnica di validazione è basata sulla crittografia di una chiave pubblica: Il server che invia l'email aggiunge il nome a dominio al messaggio e vi affigge una firma digitale. Questa chiave è posta nell'intestazione DKIM-Signature: del messaggio. Colui che riceve il messaggio può controllare la validità della chiave pubblica leggendo un record TXT del DNS del dominio associato al messaggio.
Sei invitato a dare un'occhiata alle pagine man a partire da qmail-dkim(8) e spawn-filter(8).
Changelog
- Jan 29, 2026
- Bug fix for verifying multiple DKIM signatures (second one always failed due to a DNS lookup bug). tx Andreas Gerstlauer
- Jul 10, 2025
added ERROR_FD=2 in control/filterargs to send error output of qmail-dkim in stderr when acting as a qmail-remote filter (Andreas Gerstlauer)
- Feb 12, 2024
- v. 1.48: fixed minor bug using filterargs for local deliveries (commit)
- Feb 6, 2024
-DKIM patch upgraded to v. 1.47
* fixed a bug which was preventing filterargs' wildcards to work properly on sender domain
- Jan 11, 2024
- version 1.46
* dk-filter.sh has been dropped. If signing at qmail-remote level, before upgrading, you have to review the configuration as explained below.
* The variables USE_FROM, USE_SENDER and DKIMDOMAIN have been dropped
* when signing at qmail-remote level qmail-dkim now has to be called directly by spawn-filter in the rc file. man spawn-filter for more info
* In case of bounces the signature will be automatically based on the from: field. This will solve issues of DMARC reject by google in case of sieve/vacation bounces.
* In case of ordinary bounces (mailbox not found, for instance) the bounce domain will be taken from control/bouncehost and, if doesn't exist, from control/me
- Jan 4, 2024
- patch upgraded to v. 1.44
* fixed an issue with filterargs where spawn-filter is trying to execute remote:env xxxxx.... dk-filter. This issue happens when FILTERARGS environment variable is not defined in the qmail-send rc script.
* dkim.c fix: https://notes.sagredo.eu/en/qmail-notes-185/configuring-dkim-for-qmail-92.html#comment3668
* adjustments fo dk-filter and dknewkey man pages
- Nov 20, 2023
* The patch now by default excludes X-Arc-Authentication-Results
* dkim can additionally use the environment variable EXCLUDE_DKIMSIGN to include colon separated list of headers to be excluded from signing (just like qmail-dkim). If -X option is used with dk-filter, it overrides the value of EXCLUDE_DKIMSIGN.
- Feb 19, 2023 (v. 1.37 upgrade)
- ed25519 support (RFC 8463)
- multiple signatures/selectors via the enhanced control/dkimkeys or DKIMSIGN / DKIMSIGNEXTRA / DKIMSIGNOPTIONS DKIMSIGNOPTIONSEXTRA variables
- domainkey script replaced by dknewkey in order to create ed25519 keys and rsa keys with 1024/2048/4096 bit
- dropped yahoo's domainkeys support (no longer need the libdomainkeys.a library)
- man pages revised and enhanced
- domainkeys directory moved to /var/qmail/control/domainkeys
- the documentation in this page has been revised. You can find how to sign with the rsa key together with the ed25519 key below.