Email From PayPal Black Listed

From: server@toastmastersclubs.org
Email 1)
"You do not have the right permissions to send an e-mail to this e-mail address (whitehatters toastmasters <treasurer-8327@toastmastersclubs.org>) from service@paypal.com . Be sure your "From" address in your e-mail client is the same as your address in your toastmastersclubs.org member profile."Email 2)
"You have been blocked (black listed) from sending emails to this address (treasurer-8327@toastmastersclubs.org) from service@paypal.com."

This is our Club Treasurer's email address.
We use Paypal and Venmo to collect dues as well as special event donations...
How do we unblock this?

Please read the documentation on email security on how to white list an an email address.
support.toastmastersclubs.org/doc/item/reducing-spam