[qHss6ID2JSztUgr]

> Host mail.jobs.at.poinsignon.org not found: 3(NXDOMAIN)

(A bit of a missed opportunity; the author should really set a AAAA record there IMHO)

There's no actual requirement that your PTR records resolve back to the same IP. Historically very little software bothered to check, and most of the Unix-y diagnostic software has never been updated to do so...

[josteink]

> Historically very little software bothered to check

For some reason, most IRC servers tend to do this.

[bawolff]

Unless you send email.