user@mx-sec-a-unsec.test.ex is undeliverable: all relevant MX records point to non-existent hosts
user@mx-sec-a-sec.test.ex
router = dnslookup, transport = smtp
- host a-sec.test.ex [V4NET.0.0.100] MX=5 ad=yes
+ host a-sec.test.ex [V4NET.0.0.100] MX=5 AD