Outlook emails not deliverable to yahoo and aol

We are having the same issue. Our domain name is @ahif.org and any help you can provide is appreciated.

Thank you!

Just to reiterate for you and all the people coming here, thinking Microsoft can fix this for you, they cannot. If you are using your own domain (aka: custom domain) for email hosted in M365, you need to work with your IT or your domain host, or do your own research to confirm that the necessary DNS records.

I find SPF records are the easiest to create and manage. You can look up your SPF record by doing a google search for "spf lookup". I most often use the checker from MX Toolbox. If you are using M365, your SPF should look something like this -

v=spf1 include:spf.protection.outlook.com ~all

At the bottom of the lookup, it will tell you "Reported by", this will tell you who is hosting your DNS, that is where the SPF record gets created / modified. You log in or reach out to that DNS hosting company, and create or edit the TXT DNS record for SPF there. Setting up DKIM and DMARC gets a little more complicated, and are not necessary if you have a valid SPF record, and turn off the SPF record for the "OnMicrosoft.com" domain which I outlined in my post on page 2 of this thread.

FOR ANYONE continuing to post to this thread looking for a solution, they only way the community can offer insight into your specific problem will be for you to post your domain name, then we can lookup the details and try to offer additional guidance.

I only use Microsoft Exchange Plan 1 for all incoming/outgoing mail. No other mail hosts/systems need to be in my DNS records.

Yours sound more complex. Yeah I did notice reference to Google and mcsv.net in your record(s) among others (AWS, uuserver etc). You need to review the article I gave you earlier and decide what to do with your DNS records. I can't help you with that, sorry.

Also - there's a reference to mcsv.net, which appears to be from Mailchimp.

There was a notification a little while ago that DMARC, DKIM, and SPF records needed to be updated and validated in order for their service to work, so I cut-and-pasted whatever they generated into our records.

We also (but rarely) route mail from a Gmail account to our uugrassvalley.org emails.

Could that be why there is an additional part in our record?

Again - thanks for sharing your knowledge on this. I'm a bit lost, but trying to catch up!

Your MX record points to Microsoft 365 mail hosting service. Do you use other email hosting service? Your mail related DNS records appear to show more info than necessary IF Microsoft 365 is your only service for all incoming/outgoing email.

This article should help you construct the correct SPF, DMARC, DKIM records for your domain: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-spf-configure?view=o365-worldwide