I belong to a local charity and we are having big issues with our email delivery. They have lots of volunteers and don't want their personal email addresses published. So they have set up forwarding on their hosted mail platform.
This means that Joe Public sends an email to the charity email address and it in turn is forwarded in the background to 10 volunteers to their own personal email addresses. For some reason, it fails for some inbound emails. Particularly from Yahoo.co.uk email addresses. The inbound email never makes it to the volunteers' personal accounts.
So if Joe Public sends an inbound email from abc@Yahoo.co.uk to the published charity address it never arrives and he doesn't get an error back.
Someone has mentioned DMARC and SPF, but I don't know how or what to check on the domain.
The domain is TrinityChurch.tc. Can anyone point me in the right direction please? I am struggling with the hosting provider as I'm not sure what to ask them to look at.