PTR

a.spamfilter.steadfast.net

A record for

`mx0.steadfast.net`
	A	2607:f128::e
	A	2607:f128:1::e
	A	67.202.100.15
	A	216.86.146.40
`spamfilter01.steadfast.net`
	A	2607:f128::e
	A	67.202.100.15
`a.spamfilter.mygoto.com`
	A	67.202.100.15
	A	216.86.146.40
`a.spamfilter.netwisp.com`
	A	67.202.100.15
	A	216.86.146.40
`a.spamfilter.webserverbox.com`
	A	67.202.100.15
	A	216.86.146.40
`a.spamfilter.steadfast.net`
	A	2607:f128::e
	A	2607:f128:1:7::e
	A	67.202.100.15
	A	216.86.146.40

mx0.answertechnologies.com

Chicago, Illinois, 🇺🇸 USA

^{🇺🇸 STEADFAST267.202.100.0/23 Steadfast Networks}