mail.streamwood.net has no MX records.
Question and response
Question
dig mail.streamwood.net. MX
Answer
The response has no answer records.
Authority
streamwood.net. 3600 SOA DNS105.REGISTER.COM. root.REGISTER.COM. 124072210 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0