topic Re: TT991 why is your mta blocking every email in Email

TT991 why is your mta blocking every email

Charlie247 — Tue, 05 Sep 2023 21:45:58 GMT

we have recently launched a new mta to expand our capacity (currently we send approx. 6-9 million emails a month) if we push the mail through the new mta we are constantly blocked with error TT991. we can send if we are lucky 3 an hour of ones that have retied for days.

the recent issues started are around the implemented cloudmark however cloudmark do not have us listed https://csi.cloudmark.com/en/reset/

it is clear its not a content and defiantly not on delay to scan as previously inferred as the take pattern is too constant and the content is the same.

please explain why you are backlisting our IP's when they are not listed on any RBL sites or bad reputation sites.

something has changed in the last 3-4 weeks which now means its a no or go scenario like you have an IP reputation list out of date.

we can send to every other provider so please explain how we can send to your customers that have double opted in to our emails as transaction emails.

Many thanks!

Re: TT991 why is your mta blocking every email

Gondola — Tue, 05 Sep 2023 22:07:27 GMT

Your mail is not being blocked if there's a TT991 bounce as that will describe what's happening as "deferred for scanning". i.e. delayed delivery.

However, if you immediately start sending millions of emails into TalkTalk then inevitably mail will get dropped because the scanning process will take time and would be overwhelmed. So, as with every new service / new MTA you need to have a slow start up period so your sending reputation can be built up. When deemed that there's no need to scan every mail message then your mail delivery will not be deferred all the time.

Re: TT991 why is your mta blocking every email

Charlie247 — Wed, 06 Sep 2023 07:52:34 GMT

We are drip feeding the Mail to TalkTalk so far we are trying to push around 60 a day of just talktalk emails but cannot even do that. Something changed around the 30th August like the scanning queue is overwhelmed (not by us). We are trying to send 8 emails today and are already 7 hrs in to attempting to send.

Is there a build up rate you can recommend as we are happy to go slower if there is a solution?

Re: TT991 why is your mta blocking every email

Gondola — Wed, 06 Sep 2023 08:11:49 GMT

Start with a handful of messages to customers that you're sure are going to open the messages. Reputation needs to be built over several weeks. I'm sure you know this anyway.

I'll ask TalkTalk Community Support to pick up the topic and they'll ask for the domain to pass on to the email admins.

Re: TT991 why is your mta blocking every email

Ady-TalkTalk — Wed, 06 Sep 2023 09:05:07 GMT

Hi Charlie247, please add the affected sending address in private notes on your community profile and I'll check it for you.

Ady

Re: TT991 why is your mta blocking every email

Charlie247 — Wed, 13 Sep 2023 07:26:11 GMT

Hi Ady,

I sent you a private message as requested last week but have not heard anything back.

Re: TT991 why is your mta blocking every email

Gliwmaeden2 — Wed, 13 Sep 2023 07:32:23 GMT

Staff don't respond to PMs unless they asked you to reply about something, @Charlie247.

The information should have been put in Private Notes which is different - it's at the end of the Personal Information section in your community forum profile details.

Go via your avatar/name; settings. SAVE CHANGES.

Re: TT991 why is your mta blocking every email

Ady-TalkTalk — Wed, 13 Sep 2023 11:10:00 GMT

Hi Charlie247, I've passed the information on to the email team and asked them to investigate.

Ady

Re: TT991 why is your mta blocking every email

Charlie247 — Wed, 11 Oct 2023 16:34:55 GMT

Any update as nothing has changed and this has been weeks now?

Re: TT991 why is your mta blocking every email

Ady-TalkTalk — Fri, 13 Oct 2023 04:59:17 GMT

I'm afraid I've had nothing back. Well that's not fair to the networks team they have acknowledged the need for a Postmaster system to help ISP/ESP get faster response through direct contact which after 8 years of prodding and poking isn't too bad, but it doesn't help you.

Ady

Re: TT991 why is your mta blocking every email

Charlie247 — Wed, 18 Oct 2023 19:54:57 GMT

so where does this leave us other than several months of failed emails and a queue that constantly growing. if you don't have the contacts who do we exoculate this to?

Re: TT991 why is your mta blocking every email

Ady-TalkTalk — Thu, 19 Oct 2023 08:20:40 GMT

You could make a complaint. You'll find the details of how at the bottom of each TalkTalk web page.

Ady