Yes, AWeber supports Require-Recipient-Valid-Since for sending to a variety of 
domains.

Cheers,
Tom Kulzer
CEO & Founder
AWeber Communications
https://www.aweber.com <https://www.aweber.com/>


> On Nov 13, 2019, at 1:51 PM, Brandon Long via mailop <mailop@mailop.org> 
> wrote:
> 
> Does anyone use Yahoo's Require-Recipient-Valid-Since for sending ESP mail?
> 
> Do they still support that after the merger with Oath?
> 
> Brandon
> 
> On Wed, Nov 13, 2019 at 5:29 AM Vaibhav via mailop <mailop@mailop.org 
> <mailto:mailop@mailop.org>> wrote:
> Hi Vytis,
> 
> Yes we validated the same where we could see same account is exist in real 
> world & engaged with brand emails in past 30 days.
> 
> --Vaibhav
> 
> On Wed, Nov 13, 2019 at 6:48 PM Vytis Marciulionis 
> <marciulionis.vy...@gmail.com <mailto:marciulionis.vy...@gmail.com>> wrote:
> Hi Vaibhav,
> 
> Are you able to confirm that those mailbox really exist? Occasionally Yahoo 
> cleans up their mailboxes, so some times bounces may increase. On our end I 
> do not see any increases in bounces in the last 24 hours.
> 
> Regards,
> Vytis
> 
> On Wed, Nov 13, 2019 at 7:25 AM Vaibhav via mailop <mailop@mailop.org 
> <mailto:mailop@mailop.org>> wrote:
> Hi Everyone,
> 
> Recently we observed we are getting false bounce reason within month time. As 
> per our analysis Yahoo is throwing bounce reason as " 554 delivery error: dd 
> This user doesn't have a yahoo.com <http://yahoo.com/> account ([EMAIL]) "
> 
> We identify the same issue across our customers. Few customer we noticed 
> around ~25% false positive bounces.
> 
> Here is sample for one user,
> 
> Email bounced :
> 
> 2019-09-30 16:37:24
> mta5.am0.yahoodns.net <http://mta5.am0.yahoodns.net/> (98.136.96.77)
> 554 delivery error: dd This user doesn't have a yahoo.com <http://yahoo.com/> 
> account ([EMAIL]) [-9] - mta4274.mail.ne1.yahoo.com 
> <http://mta4274.mail.ne1.yahoo.com/>
> 
> Email successfully delivery :
> 
> 2019-10-31 11:54:11
> mta5.am0.yahoodns.net <http://mta5.am0.yahoodns.net/> (98.136.96.76)



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