Mailchannels blocking emails

[Genestoy]

My host uses Mailchannels and I have been getting LOTS of blocked emails that the forum sends out when the member is following a topic or receives their digest. My host has been contacting Mailchannels but seems to be getting nowhere as they have not slowed down even though Mailchannels says they have resolved the problem, NOT! I do not send out any bulk emails at all. The registration validation emails seem to go out just fine as well as PM emails. Using IPS 4.3 anything I can do to stop this?

Thanks