mail2.maltanet.net has no MX records.
Question and response
Question
dig mail2.maltanet.net. MX
Answer
The response has no answer records.
Authority
maltanet.net. 86400 SOA dns1.namecheaphosting.com. cpanel.tech.namecheap.com. 1764228024 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0