#dnstips — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #dnstips, aggregated by home.social.
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Saturday DMARC tip: check your subdomains
your main domain might be at p=reject
but what about mail.yourdomain.com?
or marketing.yourdomain.com?
DMARC policies automatically cascade to subdomains (but not all MTA providers respect it!)
you are strongly recommended to explicitly set `sp=reject` in your organizational domain's record
without it, every subdomain inherits p=none by default
-
Saturday DMARC tip: check your subdomains
your main domain might be at p=reject
but what about mail.yourdomain.com?
or marketing.yourdomain.com?
DMARC policies automatically cascade to subdomains (but not all MTA providers respect it!)
you are strongly recommended to explicitly set `sp=reject` in your organizational domain's record
without it, every subdomain inherits p=none by default
-
Saturday DMARC tip: check your subdomains
your main domain might be at p=reject
but what about mail.yourdomain.com?
or marketing.yourdomain.com?
DMARC policies automatically cascade to subdomains (but not all MTA providers respect it!)
you are strongly recommended to explicitly set `sp=reject` in your organizational domain's record
without it, every subdomain inherits p=none by default