@Bill_42 Rogers is likely blocking it because the servers think it is spam, do you get a bounce back?
You can try contacting the server admins through the contact on this page.
https://support.shaw.ca/t5/internet-articles/shaw-email-faq/ta-p/5597#content-section-0
@Bill_42 -- tell us about the computer that the church is using, e.g., Apple or Windows, and which E-mail program they are using (Windows 10 Mail? Microsoft Outlook? Shaw WebMail? Thunderbird?) and which ISP (Shaw? Telus? Rogers? other?) that is providing the "outgoing" mail-server that receives the messages that are sent.
It's possible that the ISP's mail-server is being blocked by Shaw's "incoming" mail-server.
The "bounce-back" message should be examined.
If a message is sent only to one of the "@shaw" IDs, does it get received?
Thanks very much for your reply!
Especially thanks for the contact info for the Shaw server admins; I've contacted them.
To answer your question, there is no bounce back.