emails are bouncing back when sending to yahoo

I just got Microsoft on the phone (I called into 800-865-9408, waited about 30 minutes for someone) and this is what they had me do to fix this issue:

Login to https://admin.microsoft.com

On the left pane, click Show All > Settings > Domains

My main domain had an issue under the Status column to show that we were having a problem

Click the 3 dots and choose Manage DNS

Click Continue twice and it will take you to your domain setup. I had a handful of SPF records listed and it says that you can only have one. This was my problem.

I logged into my DNS Server (my host uses cPanel) and went into the section where the TXT and CNAME entries are (I think it's called Zones in cPanel)

I looked through and found all of the SPF entries (literally just ctrl+F SPF to find them) for the main domain - sub-domains didn't matter for me.

I went to Chat GPT and asked it to help me combine the SPF records and copy/pasted all of the ones I had in there (YMMV with Chat GPT). I used the output and pasted it into a TXT entry and deleted the others.

I went back to Microsoft and it recognized that I only had the one SPF record and it looks fixed now.

Hope this helps someone!

You need to get your admin (if it is not you) to create a ticket with Microsoft and they will call you. It doesnt take long for them to fix the problem. You do need to know where you bought your domain so they can link them together.

how do you actually get support on the phone?

It is really an easy fix once you contact Microsoft (admin must contact them) and they put in the codes to show you are a legit account. This happened due to Yahoo putting in higher security to try and keep spammer out but in the process blocked legit businesses. GLAD MINE IS FIXED! Now back to selling vacation packages.

My bounce messages said SPF, DMARC, and DKIM pass too. So it appears to be a yahoo error, not our exchange 365.

David