[GLLUG] Checking mail server configuration specifically for IPv4

[John Winters]

Dear all,

I've been having a recent problem with one of my mail servers and one 
particular e-mail provider not liking its reverse DNS lookup result for 
IPv4.

I tend to use check-auth at verifier.port25.com to diagnose these things 
but I've hit a problem.  Both my mail server and theirs are fully IPv6 
enabled, and all is good in IPv6.

Does anyone know a way of forcing a similar check to use IPv4?  The 
e-mail provider with whom I'm having difficulty publishes only IPv4 MX 
records.

TIA,
John

-- 
Xronos Scheduler - https://xronos.uk/
All your school's schedule information in one place.
Timetable, activities, homework, public events - the lot
Live demo at https://schedulerdemo.xronos.uk/