My MiaB mails are no longer delivering to yahoo accounts

Hello house,
Please, my MiaB no longer deliver mails to yahoo mail accounts, unlike before. Even the ones delivered to gmail accounts land in the spam. My domain and IP Addresses are in good conditions. What’s happening? What could be the cause of this? How can I rectify this? Thanks

Are your emails being returned undeliverable? If so what do they claim the issue is.

If they are just disappearing, then for some reason they must think that you are sending spam. You could try writing to from your postmaster account. (Your MiaB administrator account with an alias for postmaster set up in Roundcube)

I do not know if they will be responsive or not as Yahoo has a reputation for just dropping mail without warning.