dub3.computerline.net has no MX records.
Question and response
Question
dig dub3.computerline.net. MX
Answer
The response has no answer records.
Authority
dub3.computerline.net. 28800 SOA zrh.ns.computerline.net. ns.computerline.net. 2025082356 28800 7200 1209600 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0