mx02.speakeasy.net has no MX records.
Question and response
Question
dig mx02.speakeasy.net. MX
Answer
The response has no answer records.
Authority
speakeasy.net. 300 SOA ns1.megapath.net. support.megapath.net. 1761226104 14400 3600 2718281828 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0