I am hosting my site on HostGator. The problem is that I can not receive e-mails from some domains.
Here is the SMTP transaction response received:
H=(sv2.elanceonline.com) [18.104.22.168]:38251 I=[22.214.171.124]:25 F=<email@example.com> temporarily rejected RCPT H=(sv2.elanceonline.com) I=[126.96.36.199]:25 sender verify defer for <firstname.lastname@example.org>: host lookup did not complete Unable to resolve svbounce.elanceonline
The support person at HostGator insisted that the problem is on domain-side, but I am very sure it is on HostGator's side because I never had any such problems before using HostGator, and now in the course of 2 days I'm having the same problem with 2 different senders.
I can receive from both domain's emails to Gmail at the same time without any problem, but once I type
mydomain.com is hosted on HostGator) I cannot receive e-mail.
What could be reasons for not being able to resolve
svbounce.elanceonline or other domains? Should I trust HostGator and believe them that it's not a problem on their side?