pkgmgrrepo.replibit.com has no MX records.
Question and response
Question
dig pkgmgrrepo.replibit.com. MX
Answer
The response has no answer records.
Authority
replibit.com. 900 SOA ns2.efscloud.net. domainadmin.efolder.net. 16 900 600 86400 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0