mail.endstream.com has no MX records.
Question and response
Question
dig mail.endstream.com. MX
Answer
The response has no answer records.
Authority
endstream.com. 3600 SOA ns.endstream.net. hostmaster.endstream.net.endstream.com. 2026011201 14400 900 1800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0