mail.baeretswil.org has no MX records.
Question and response
Question
dig mail.baeretswil.org. MX
Answer
The response has no answer records.
Authority
baeretswil.org. 900 SOA dns1.i-web.ch. hostmaster.i-web.ch. 2019020401 21600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0