messg spam from my office email to yahoo

I started experiencing this problem as well with some of the clients I support. While investigating, I bumped into this article from 2016 -> https://docs.microsoft.com/en-us/archive/blogs/tzink/the-outbound-ip-and-helo-format-for-office-365. Seems like this EHLO setup is intentional from Microsoft's part and is unlikely to change. This probably means the ball may be in Yahoo's court to allow the Office 365 IP ranges or provide a different solution. Either way, I'm not full of confidence that either Microsoft or Yahoo will resolves this anytime soon.

You can hit on an option given just below the email body text or in footer of email -
"This is not a spam" then email would move back to your inbox - this is a manual action.
I guess you need some automatic tool that can set function to not to mark your Office Email as spam.

Figured I'd chime in on this thread as I have a customer who is experiencing the same issue. It started around the time this post was made.
What really sucks is my customer is a nonprofit that relies on email communication for donations.

With ATT(Now using yahoo mail services) snatching up all of the various small ISPs in my area 15 or so years ago now, a lot of people around here still use those defunct domain names, IE: snet.net, sbcglobal.com
That yahoo email services are responsible for.
While not confirmed it may be also occurring for anyone who uses their email services with their custom domain as well.
But any O365 mailbox sending to a test mailbox @att.net ends up in spam.
If the customer who uses O365 uses a 3rd party mail service to filter mail outbound, (Proofpoint, barracuda, etc), those emails from O365 will pass without issues to yahoo since the message headers in the email will show it came from that 3rd party service instead of O365. This seems to be the only workaround right now..

Since we are all sharing the same exact response yahoo is giving us..

1st response...
Thank you for contacting Yahoo Postmaster.

I understand that your emails are incorrectly delivered to the customer's spam folder. I know how inconvenient it is to you. I'm happy to help.

I've reviewed your case and recently you may have noticed an increase in mail going to the spam folder for senders using Office 365 and other Microsoft products. We are in the process of addressing this issue and expect it to improve over the next several days. Please have your recipients mark the mail in the spam folder as “not spam” or “ham” and that will help to correct the issue. Thanks for your patience.

I hope you find this information useful. Do not hesitate to reach out to us if you have any other questions!

Regards,

Gold
Yahoo Postmaster

2nd response
Hi,

Thank you for reaching back out to us.

I understand that you're still having an issue with your spam emails. I'll do my best to help you.

We understand it's frustrating when things don't work as intended. At this moment, we can only advise that you have your recipients mark your mail as "not spam" or "ham" as you receive contacts regarding this issue.

Our engineering team has determined that there isn't a specific fix date for this issue, but we're still working diligently to find additional resolutions.

We appreciate your continued patience and value having you as a customer. Please let us know if there's anything else we can assist you with.

Warm Regards,

Joms
Yahoo Customer Care


Do I have any confidence that yahoo is treating this seriously with severity, and will be able to fix this issue within a "few days"

No... I don't think yahoo had it together since the early-mid 2000s and is just one big spaghetti mess of corporate acquisitions.

We're having the same issue and its a real problem for us. I opened a ticket with Yahoo back on May 19th and got no where with them. I went ahead and opened another one to see if they have any updated info on this issue (you can too here:
https://senders.yahooinc.com/contact )
I also opened a ticket with Microsoft to see if they can help as well. I'm not very hopeful on either front though.

I too have been battling this for a few weeks. The problem isn't just with a single tennant of O365, it is all MS platforms to all Yahoo platforms.

Hotmail, Live, Outlook or O365 to any domain mail hosted by Yahoo. This includes ATT.net, RocketMail, Prodigy.net and the likes.

The notion that users are frequently checking their spam folder for legitimate email is nonsense.

Yahoo also doesn't have a means for adding a domain to an allowed list either at the platform level or individual user level.

Google to Yahoo is working, but I echo others in this thread, there are millions of users on both MS and Yahoo who are having communication moved to the Junk folder.

I too paid for Yahoo support and received the same blanket email about Spam/Ham, and there is no means for communicating to customers, prospect employees or small business owners/partners that messages are being blocked by their email provider.

I went ahead and paid for the Yahoo support subscription. I spoke with someone on the phone and they acknowledged the Microsoft 365 direct-to-spam-folder email issue. They said they are working it. When I mentioned this has persisted for more than two weeks, they said there was no ETA for a solution. When I asked the Yahoo technician if there was any public status board mentioning the issue to refer my clients to, they hung up.