Emails to me are bouncing back: message 'Too many invalid recipients' (TT405)

[Bray2]

This has been happening infrequently for some weeks, but in last few days it is happening a lot. 

No obvious pattern - the same person can send 3 emails that get through, then 1 bounces back

People can forward same email later and it gets through

Sometimes other addressees are copied in when a message bounces, sometimes message is just to me

Big problem for me as I have work deadlines and don't know if I am receiving emails 

Please help

Tiscali email address

[Bray2]

I haven't been able to get a clear answer of what happened with the btinternet sender: it looks like the sender had their reply to me marked [SUSPECT] and moved into their junk folder, as opposed to getting the TT405 failure message that others got.

[Bray2]

I will try and find out - thank you

[Gondola]

Hi @Bray2 

Grateful thanks for responding. Just to confirm - did the btinternet.com recipient also get the same TT405 bounceback or something different?

[Bray2]

Hi, yes a lot of gmail and googlemail but also a btinternet.com 

[Gondola]

Hi Robin

What email domains are in use by the originators of the mail messages getting the TT405 bounceback? Just the part of the address after the @ symbol. We thought it was just gmail and googlemail and personal domains using google servers that can be impacted by the effects of rate limiting so it would be really helpful to know of any other examples.

[RobinDodridge]

I’ve added two known addresses which are having intermittent issues to my private notes on my profile 

[RobinDodridge]

We are also receiving the same issue with multiple users now, sometimes emails come through and sometimes they don’t, this has never been an issue until the last two weeks or so 

The response from the remote server was:

550 5.1.0 BXy7rG7lQoQuT Too Many Invalid Recipients (TT405)

Email address in the chain is correct, I have asked them to remove the address from auto cache and re-type it manually however issue has re-occurred 

[gazzawazza]

some senders to my address (lineone domain) are getting these too.

TT405 "too many invalid recipients"

only a handful over last 2-3 weeks but there again, these are just those being reported to me

Could this issue be investigated for me too please?



thanks,

Gary

[Michelle-TalkTalk]

Morning,

I'm sorry to hear this. I've raised this over for investigation now and will post back as soon as I receive an update on this.

Thanks

Michelle

[Bray2]

Thanks so much for this help @Gliwmaeden2 

@Ady-TalkTalk I have now put a selection of senders' email addresses in private notes. The problem is still ongoing. 

[Bray2]

Thanks very much Gondola. The error code is actually TT405. I have asked senders to check if my email address appears correctly and it does. Any other thoughts? Much appreciate your help.

[Gondola]

Hi @Bray2 

You say

---

"Often it is in reply to one of my emails"

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This suggests that what's triggering the TT405 error is that the Reply-To: email address is incorrect. I say this because TT405 means the sender has been detected as sending to incorrect email addresses at TalkTalk Mail.

The new TalkTalk Mail platform does have the ability to define a Reply-To email address but if that's entered incorrectly or there's a glitch in the system that's adding an incorrect email address as a Reply-To then the TT405 error would result.

I've tested that manually entering a correct email address in the Reply-To box does work on a round trip email sent to BT Mail from one TalkTalk address with the reply coming back to a second TalkTalk address. So the mail platform does work as expected based on this test.

If your recipients check the email header (View source) they'll be able to tell you if there is an incorrect Reply-To email address present.

[Gliwmaeden2]

@Bray2 it will help if you complete your community forum profile details. 

Go via your avatar/name; settings.

From the drop down menu, choose Personal Information. Complete that fully. 

At the end of that section, in Private Notes add the list of affected addresses. SAVE CHANGES. 

@Ady-TalkTalk, this customer doesn't appear to have PMs enabled.

[Bray2]

I still haven't found where to post private notes to you on my profile but if it's any help the senders are not all gmail if that is what you wanted to know

[Bray2]

Thanks Ady. Really appreciate you helping. I can't find private notes under my profile? - can you direct me where to find them?

[Ady-TalkTalk]

If you can add 2 or 3 to your profile so that we can investigate further that would really help. 

Ady

[Bray2]

Thanks for responding but it is multiple senders - I have heard from at least half a dozen different people that this has happened to them, and that's just the ones I know about. Often it is in reply to one of my emails, so can't be a case of them entering my email wrong.

[Ady-TalkTalk]

Hi Bray2, the sender isn't accidentally trying to send to partial/incomplete addresses are they? Please add the sender addresses to private notes in private notes of your community profile. 

Ady