I recently moved a number of sites to a new host and with that move have begun to have issues with email notification: new member, profile edit, new entry. The curious thing is that the notification issues are limited to domain-specific email accounts. For example, if I put a person from the client organization in the notification list as well as myself, and they have a company email associated with the domain and I include my email, which is not, I will get the notification but they don't.
Has anyone experienced this? If so, what could be the root cause? It is a challenge to take this issue to the hosting provider because they will see it as an Expression Engine problem, which of course they wouldn't support.
I am open to any and all suggestions for a solution to this.