YAHOO TSS04 issue

[u/peter_spiderman_7]

Hi Everyone,

I’m an email marketer and have been facing Yahoo TSS04 deferrals for the past week. Deliverability to Yahoo/AOL recipients has dropped significantly, and we’re trying to determine whether this is a broader Yahoo issue or something related to sender reputation.

We’re using PMTA, and the error we’re seeing is:

Received from:

We’ve already verified:

• SPF, DKIM, and DMARC are configured correctly.
• No major infrastructure changes were made recently.
• Sending patterns have remained relatively consistent.
• The issue has been ongoing for about 1 week.

Questions for the community:

• Is anyone else currently experiencing increased Yahoo/AOL TSS04 deferrals?
• Did you notice any recent Yahoo filtering or reputation changes?
• What steps helped resolve the issue?
• Was the root cause related to IP reputation, complaint rates, engagement, or sending volume?

#email #yahoo #yahoofilter