mail.tellcom.com.tr has no MX records.
Question and response
Question
dig mail.tellcom.com.tr. MX
Answer
The response has no answer records.
Authority
tellcom.com.tr. 3600 SOA ns1.turkcell.com.tr. system.superonline.net. 2023112205 3600 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0