You really should have an MX record though. Fallback to A is deprecated and really should have been removed by now.
HE provides professional network services and probably, perhaps even contractually, requires you to have two different ways to reach you. Everyone at that level has quick ways to get in contact with all their business partners, usually a phone number that's active 24/7.
HE provides professional network services and probably, perhaps even contractually, requires you to have two different ways to reach you. Everyone at that level has quick ways to get in contact with all their business partners, usually a phone number that's active 24/7.