Yahoo Mail Sending Delays

This incident has been resolved.

We are seeing signs of recovery. Yahoo's mail servers are beginning to accept messages normally and delivery rates are improving.
Current Status:

Yahoo appears to be resolving their infrastructure issues
Delivery success rates are increasing
Queued messages are being processed and delivered
We continue to monitor closely to ensure full recovery

What to Expect:
Messages that were queued during the incident are being delivered as Yahoo's systems recover
You may see a temporary spike in delivery volume as the backlog clears
Delivery times should return to normal as the queue processes

We will continue to monitor the situation closely and will post a final update once we confirm full recovery.

We have confirmed this is an issue with Yahoo's receiving infrastructure. Yahoo's mail servers continue to return temporary failure codes that are preventing normal mail delivery.

Current Status:
The issue has been confirmed to be on Yahoo's side
Our sending infrastructure is operating normally
All queued messages will be delivered automatically once Yahoo resolves their infrastructure issues
No customer action is required

Error Messages You May See:
If you're monitoring your delivery logs, you may see the following (non-inclusive) temporary failure messages from Yahoo:
451 4.4.2 [internal] no BODY response
451 4.4.2 [internal] connection closed by remote host
451 4.4.2 [internal] no MAIL FROM response
451 4.4.2 [internal] no RCPT TO response
421 Service not available, closing transmission channel tnmpmscs

These are all temporary errors from Yahoo's infrastructure. Messages receiving these errors are being automatically retried and will be delivered once Yahoo resolves the issue.

We are continuing to monitor the situation and will provide updates as Yahoo works to resolve this on their end.

We are currently experiencing delays in email delivery to Yahoo recipients. Our monitoring systems have detected increased queue times for messages destined for Yahoo domains (yahoo.com, ymail.com, etc.).
Current Status:

Email delivery to Yahoo is experiencing delays
This appears to be a receiving issue on Yahoo's infrastructure
Our sending systems are operating normally
All other ISPs and providers are unaffected

Impact:
Messages to Yahoo recipients are being queued and will be delayed
No messages are being lost or dropped
Our systems will continue automatically retrying delivery per our normal retry schedule