[mailop] Reg. delivery issues at Yahoo ISP

[Vaibhav via mailop]

Hi Everyone,

Has anyone observed delivery issues with Yahoo ?

Recently in the past one week we observed below delivery issues at Yahoo
ISP.

1 ) TSS04 delivery issue. ( Known for some time now ) - With dedicated
delivery IPs , Newly onboarded customers , Customer sending triggered /
transactional volume. We do the same issue with different mail streams.

2 ) Inbox delivery issue : - Email is getting filtered as spam where in
history we didn't observe any such deviation.  Lots of triggered /
transactional emails are getting filtered as spam where we don't see any
throttling on dedicated IP space.

Does anyone have any inputs ? How do we address this issue? as we are not
getting the right inputs for the Yahoo Postmaster team.

--Vaibhav
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[mailop] Reg. Virginmedia SMC Policy Violation bounce error

[Vaibhav via mailop]

Hi,

We're an ESP sending emails on behalf of clients who are receiving the
following bounce error from virgin media domains (blueyonder.co.uk,
ntlworld.com, virginmedia.com) across multiple different domains and IPs:

SMTP Error : *421 4.2.0 MXIN618 Temporary SMC Policy Violation detected,
retry later
;id=MVLFlm4kdboSoMVLGlk2I5;sid=MVLFlm4kdboSo;mta=mx1.tb;dt=2021-03-17T13:32:03+01:00*

We have tried "sending later", as suggested in the error but no emails are
being allowed through. Would someone please be able to help me with the
cause of this error, and how we may resolve it moving forwards? I can't
find any information on it online nor action I can take for it to be removed

--Vaibhav
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Re: [mailop] [EXTERNAL] JMRP FBL reception stopped on Thursday evening

[Vaibhav via mailop]

Hi Michael,

Yes we are receiving the FBL feed now.

Thanks,
Vaibhav

On Wed, Sep 23, 2020 at 7:41 AM Al Iverson via mailop 
wrote:

> JMRP reporting (the FBL feed) does appear to have started up again today.
> Thanks!
>
> Cheers,
> Al Iverson
>
> On Tue, Sep 22, 2020 at 3:45 PM Michael Wise via mailop 
> wrote:
>
>>
>>
>> Is the issue still persisting, or has normal functionality been restored?
>>
>>
>>
>> Aloha,
>>
>> Michael.
>>
>> --
>>
>> *Michael J Wise*
>> Microsoft Corporation| Spam Analysis
>>
>> "Your Spam Specimen Has Been Processed."
>>
>> Open a ticket for Hotmail 
>> ?
>>
>>
>>
>> *From:* mailop  *On Behalf Of *Bressier Simon
>> via mailop
>> *Sent:* Monday, September 21, 2020 2:44 AM
>> *To:* mailop 
>> *Subject:* [EXTERNAL] [mailop] JMRP FBL reception stopped on Thursday
>> evening
>>
>>
>>
>> Hey folks,
>>
>>
>>
>> On Sendinblue's side, we are not receiving any FBL complaints from our
>> JMRP programs since Thursday evening, Is that already a known issue?
>>
>>
>>
>> Are you guys also seeing that issue on your side ? It has been confirmed
>> also by another ESP I've talked to, so I guess it is global here ?
>>
>>
>>
>>
>>
>> Best,
>>
>>
>>
>> Simon
>>
>>
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>
>
> --
> Al Iverson // Wombatmail // Chicago
> Song a day! https://www.wombatmail.com
> Deliverability! https://spamresource.com
> And DNS Tools too! https://xnnd.com
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[mailop] Reg. DKIM authentication error | Yahoo

[Vaibhav via mailop]

Hi Everyone,

We are facing some issue with DKIM authentication where if we delivery
emails to Yahoo recipients DKIM is failing with below error,

dkim=perm_fail

However the same DKIM signing process is working at Gmail, Gsuite, Hotmail
and other recipient domains.

What could be the reason for the above issue ?
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Re: [mailop] Anybody seeing a huge spike of (S3140) errors from Hotmail/Outlook started on Sep 7th

[Vaibhav via mailop]

Hi Rauf,

Yes, we observed the same things at our end. One of our customer account
got compromised which causes some spam through our system that impacted the
whole n/w from the same IP space though other IP's are dedicated and carry
a good reputation at SNDS.

We tried to reach out to the support team with multiple tickets but could
get expected responses apart from standard response. Not sure why whole n/w
blocked when only specific IP's send spam due to compromised account.

On Fri, Sep 11, 2020 at 11:22 PM Adam Moffett via mailop 
wrote:

> I have fought this battle before, and in my case it turned out to be a
> compromised user account.  Check logs for a sender with unusually high
> volume.  While you're waiting for the response to your ticket you can use
> your time to hunt for that underlying problem.  I do wish they provided
> samples of the offender's messages, as that would remove any doubt and make
> it much easier to see where the problem is.
>
> They also may not unblock you for some period of time after the activity
> stops.  I have had it take days.
>
>
>
> -- Original Message --
> From: "Rauf Guliyev via mailop" 
> To: mailop@mailop.org
> Sent: 9/9/2020 5:58:52 PM
> Subject: [mailop] Anybody seeing a huge spike of (S3140) errors from
> Hotmail/Outlook started on Sep 7th
>
> Hello there,
>
> We are seeing a huge spike in "550 5.7.1 Unfortunately, messages from [
> IP.AD.DR.ES] weren't sent. Please contact your Internet service provider
> since part of their network is on our block list (S3140)" errors while
> sending to Hotmail/Outlook. It started on Sep 7th and is affecting only one
> datacenter,  the rest is sending the same emails just fine.  The SNDS shows
> the affected IPs as green. Filed a ticket (SR1508383241) but curious to see
> if it's widespread.
>
> Thanks in advance,
> Rauf
>
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[mailop] Reg. Bounces at Yahoo / AOL

[Vaibhav via mailop]

Hi Everyone,

Recently we observed below error while delivering emails to Yahoo / AOL
recipients.

Is it expected or some error ?

*SMTP Error : 554 delivery error: dd Not a valid recipient - *

Does anyone noticed the same ?

--Vaibhav
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[mailop] Reg. false positive opens at Gmail ISP

[Vaibhav via mailop]

Hi Everyone,

Recently we observed some false positive opens from Gmail users for few of
our customers.

Lets say when we delivered 100 Emails we are getting 94-95 open hit on our
tracking pixel post delivery though user didn’t open the mail. Does Gmail
spam filters requesting all images before delivering emails to actual end
user mail mailbox ?

Does anyone observed the same issue ? While debugging we observed by
changing sending domain we don’t get false positive opens. Does Gmail has
different algorithms for set of sending domain ?

—Vaibhav
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Re: [mailop] Reg. false positive bounces at Yahoo ISP

[Vaibhav via mailop]

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> 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 
> 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 (98.136.96.77)
>> 554 delivery error: dd This user doesn't have a yahoo.com account
>> ([EMAIL]) [-9] - mta4274.mail.ne1.yahoo.com
>>
>>
>> *Email successfully delivery : *
>>
>> 2019-10-31 11:54:11
>> mta5.am0.yahoodns.net (98.136.96.76)
>>
>> --Vaibhav
>>
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>
>
> --
> Pagarbiai,
> Vytis Marčiulionis
> +37064734475
>
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[mailop] Reg. false positive bounces at Yahoo ISP

[Vaibhav via mailop]

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  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 (98.136.96.77)
554 delivery error: dd This user doesn't have a yahoo.com account ([EMAIL])
[-9] - mta4274.mail.ne1.yahoo.com


*Email successfully delivery : *

2019-10-31 11:54:11
mta5.am0.yahoodns.net (98.136.96.76)

--Vaibhav
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