app.mail.infomaniak.ch has no MX records.
Question and response
Question
dig app.mail.infomaniak.ch. MX
Answer
The response has no answer records.
Authority
app.mail.infomaniak.ch. 86400 SOA ns1.infomaniak.ch. hostmaster.infomaniak.ch. 2026020402 10800 3600 605800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0