mail.voicemail.midrivers.com has no SRV records.
Question and response
Question
dig mail.voicemail.midrivers.com. SRV
Answer
The response has no answer records.
Authority
midrivers.com. 3600 SOA udns1.ultradns.net. hostmaster.midrivers.com. 2020060586 3600 3600 86400 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0