bounce.xprofiler.ch has no MX records.
Question and response
Question
dig bounce.xprofiler.ch. MX
Answer
The response has no answer records.
Authority
xprofiler.ch. 86400 SOA ns1.mailprofiler.ch. postmaster.mailprofiler.ch. 2602160001 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0