Hey Tomas - Can you contact me off list? Thanks! Lili
*Lili Crowley* she/her Postmaster <http://www.yahoo.com/> On Thu, Aug 6, 2026 at 9:12 AM Tomas Melikoff via mailop <[email protected]> wrote: > Hi list, > > we are in the middle of warming up a set of new outbound IPs, and we've > been getting TSS04 deferrals from Yahoo/AOL for several months now: > > 421 4.7.0 [TSS04] Messages from <IP> temporarily deferred due to > unexpected volume or user complaints - 4.16.55.1 > > Some context on our sending: > > - All of our mail goes to opt-in subscribers only. Users subscribe > voluntarily to our alerts on our own sites. > - We honour unsubscribes immediately and suppress those addresses. > - We consume and honour ARF/FBL reports and suppress the complaining > recipients. > - Sender Hub shows us below the thresholds Yahoo considers spam on every > metric we can see there. > > We've spent months adjusting the warm-up: slow, steady daily volume > increases, backing off whenever the deferrals appear, and holding at very > low volumes for long periods. None of it produces any improvement. > > We've contacted Yahoo support three times through the contact form, and > all three times we received the exact same canned response, with links to > the FBL, best practices and the error-code page, and the suggestion to get > back to them if the issue persists. > > Reading If anyone has found a way out of this loop, or if someone from > Yahoo could reach out to me off-list, I'd really appreciate it. > > Thanks > Tomas > > Check out our Privacy Notice > <https://urldefense.com/v3/__https://www.lifullconnect.com/legal-mail-disclaimer/__;!!Op6eflyXZCqGR5I!BZEMfd3c85Z5Wxj2cuM4USFyZdesPiF0gStu43wwP1ETg1AHRA5nGgVd-MBvoUaD6wLWnUgNT4b7meIbYKQ$> > _______________________________________________ > mailop mailing list > [email protected] > > https://urldefense.com/v3/__https://list.mailop.org/listinfo/mailop__;!!Op6eflyXZCqGR5I!BZEMfd3c85Z5Wxj2cuM4USFyZdesPiF0gStu43wwP1ETg1AHRA5nGgVd-MBvoUaD6wLWnUgNT4b7yho-uXQ$ >
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