Mail...hecks(3)

💖 Mail::MIMEDefang::Async::Checks — the manual, but make it cute 💖

okay bestie, so this is section 3 of the manual for Mail::MIMEDefang::Async::Checks, and it's genuinely one of my faves because it's just... a whole lil box of pre-built check descriptors for Mail::MIMEDefang::Async. like, you don't have to build your own checks from scratch?? she did that for you. 🎀

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✨ NAME ✨

Mail::MIMEDefang::Async::Checks — pre-built check descriptors for Mail::MIMEDefang::Async. that's it, that's the whole name, periodt. 💅

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🌸 DESCRIPTION 🌸

every function in here returns a check-hashref, and that hashref is exactly the kind of thing you can pass straight into md_async_run_checks(). no cap. 🫶

so the vibe is: mix and match them however you want to build out the checks your filter actually needs. it's giving build-your-own-adventure but for mail filtering. iconic behavior honestly ✨

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🦋 METHODS 🦋

md_async_check_dnsbl(%args)

builds a DNSBL A-record lookup check. 🕵️‍♀️

• Required args: ip, zone
• Optional: name, timeout

md_async_check_spf_record(%args)

builds an SPF TXT-record lookup check. ✨

• Required: domain

md_async_check_mx_exists(%args)

builds an MX-record existence check. lowkey a big deal, because domains with no MX are often forged — so if the MX is missing, that's a whole red flag situation. 🚩

• Required: domain

md_async_check_rdns(%args)

builds a reverse-DNS (PTR) lookup check. 🔄

• Required: ip

md_async_check_dkim_record(%args)

builds an async lookup for a DKIM public-key TXT record sitting at "$selector._domainkey.$domain". 🔑

• Required: selector, domain

the result is the raw TXT record string, fr fr. and just so you know — signature evaluation still happens synchronously via Mail::DKIM after the key gets fetched. so the fetch is async, the eval is not. two different steps, bestie, don't mix them up. 💅

md_async_check_dmarc_record(%args)

builds an async lookup for the DMARC TXT record at "_dmarc.$domain". 🛡️

• Required: domain

and then — and this is the important part — use md_async_interpret_dmarc() from Mail::MIMEDefang::Async::Results to parse the result. like, the lookup gives you the thing, the interpret function makes sense of the thing. tag team. 🤝

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👀 SEE ALSO 👀

• Mail::MIMEDefang::Async
• Mail::MIMEDefang::Async::Results

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okay that's the whole page, you ate that 💖 this was version 3.7.1, dated 2026-07-20, and it's living in section 3 of the manual. go forth and check things asynchronously, you absolute main character. 🎀✨🦋