ESA rejecting group emails

[josephferwilliams]

We have an issue where all of a sudden emails inbound or outbound are being rejected if part of a group email. Individual emails work just fine but if it is part of a group it gets the delayed errors and finally drops and is never delivered. We have exchange and this just recently started. Any suggestions?

[Mathew Huynh]

Hey Joseph,

Can we get some sample NDRs or tracking off the ESA to have a look?

Thanks.

Regards,

Matthew