Sending to Yahoo e mail accounts from my Outlook e mail

[David675]

I have been able to send from my Outlook account to other e mail users that have a Yahoo account. about 4 weeks ago it has changed and I get error messages when I send to a person with a Yahoo mail account but they can send to me. I get an email back to me that says Delivery failed to the recipient. Would anyone know why this would happen all of a sudden. Thanks David675

[#2]

Having the same issue and include AOL and Verizon.net. Which probably means Verizon and Microsoft are having some sort of issue since VZ owns both AOL and Yahoo. This is what we get
1/17/2024 5:21:49 PM - Server at DM6PR16MB3672.namprd16.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError'
1/17/2024 5:18:28 PM - Server at mta6.am0.yahoodns.net (67.195.228.106) returned '421 4.4.2 Connection dropped due to SocketError'

[#3]

@ctwanner1355 

So we have to wait on Verizon?  

David 

[#4]

I also have a client with this problem.

They are receiving a bounce with this error - 

Remote server returned '550 5.4.300 Message expired -> 451 [RL01] Message temporarily deferred'

[#5]

@David675 

Same issue with a client in TN. 3 different accounts, 2 Yahoo and 1 AOL. Same exact message.

What's strange is that the bounce the client sent me today has a time stamp 5 hours in the future. Client recieved the bounce at about 11am Eastern Time time in the message is about 4PM same date. Either something is very wrong or message sent from another time zone outside the US?

Client using Office 365 email

[#6]

We are experiencing this as well in Australia, very frustrating. However have noted that email direct we get the same error, email via MYOB finance software and it goes through??

Anyone heard of a fix yet or ETA on a fix?

@David675 

[#7]

We cannot currently send to yahoo, aol, and a few other domains. We get the same bounceback message everyone else in this thread is receiving. 

[#8]

I'm in Australia and exact same issue - so frustrating.

[#9]

@David675 - Same issue here with Yahoo email recipients. 

[#10]

@David675 we are having the same issue for a few weeks. Getting an “undeliverable” a few days later. returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError'

Unable to email to AOL or Yahoo email accounts. For some reason we have another domain with Google and are able to send emails from there. Microsoft please fix this issue or we will port to Google. 

[#11]

@DRHinvestments 

You bring up a good point about switching to Google. In going to look at their pricing if it's comparable see you later Microsoft. Im not going to pay for an unusable email service.

[#12]

I was able to fix my issue yesterday. The bounce back is misleading but my problem ended up being that my SPF record was missing. It was there before but I was checking something else in the O365 Admin portal and decided to quickly check the domain health and sure enough my SPF record was gone. I gained access to the DNS host and put this back in place. Client is working fine now. I also checked my dkim and dmarc records. So I would make sure that your SPF is there and correct.

[#13]

@DRHinvestments 

I resolved this issue by adding a dmarc record with my dns registrar.  it would look something like this below.  it took 48 hours to propagate

_dmarc."your domain name.com" 

value "v=DMARC1: p=none; rua=mailto:"any email address you control"; pct=25;"

TTL 300 Seconds

Simple routing

no quotes with the domain or email address example below

_dmarc.microsoft.com       "v=DMARC1; p=none; rua=mailto:email address removed for privacy reasons; pct=25;"          

use an email address you don't care about expect emails daily with dmarc summary reports

[#14]

this would be a text record

[#15]

@joe_toner  Thanks.  I will try this.  It looks like: "DMARC1:" should be "DMARC1;"

[#16]

Joe, You didn't need percent to be higher than 25%?

[#17]

This SOLVED my issue! Cannot thank everyone enough. I put a TXT record into DNS for this. After doing DMARC and DKIM this finally got e-mail going back to Yahoo!. Much appreciated.

" v=spf1 include:spf.protection.outlook.com -all "

[#18]

Last year Google and Yahoo made a joint announcement that will effectively change how commercial email will be sent and received on a global scale forever. Both Yahoo and Google email platforms will begin to block and aggressively filter incoming email traffic that doesn’t meet new message authentication and procedural requirements. Additionally, they also included some infrastructure and performance thresholds associated with commercial email best practices.
Announcement from Yahoo - https://blog.postmaster.yahooinc.com/post/730172167494483968/more-secure-less-spam

Announcement from Google - https://blog.google/products/gmail/gmail-security-authentication-spam-protection/

[#19]

This resolved my issue too. Great thanks.

[#20]

@joe_toner 

Would really appreciate if you please show exactly what to enter when adding DNS record.

Type = 

Name = 

Value = 

TTL = 

Thanks!