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False rejection of valid sender domain

MJN
Aspiring Pro
Posts: 1,104
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Registered: ‎26-08-2010

Re: False rejection of valid sender domain

Nothing since.

Can you advise on what basis the rejection is made? Would a temporary DNS resolution failure (e.g. lack of response, not an positive NXDOMAIN) result in the assumption that the domain doesn't exist?

Superuser
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Registered: ‎06-04-2007

Re: False rejection of valid sender domain

After a quieter period the inbound problem topic https://community.plus.net/t5/Email/Plusnet-Email-servers-giving-random-SMTP-550-errors-for-inbound/... is hotting up again with mention of instances across servers for several brands.

@MJN Have you experienced further examples?

David
MJN
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Registered: ‎26-08-2010

Re: False rejection of valid sender domain

To be honest I gave waiting for Plusnet to even get involved, nevermind actually fix the problem, so now I send direct-to-MX instead. No problems since the change.
Superuser
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Re: False rejection of valid sender domain

I don't blame you for taking that approach. Sad

Are any of the recipient addresses at Plusnet where incoming sender rejections could occur.

David
MJN
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Registered: ‎26-08-2010

Re: False rejection of valid sender domain

They could well be but a I've only seen issue with outbound mail at the time of sending (ie not at the point of attempted delivery).
Community Gaffer
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Registered: ‎04-04-2007

Re: False rejection of valid sender domain


@spraxyt wrote:

After a quieter period the inbound problem topic https://community.plus.net/t5/Email/Plusnet-Email-servers-giving-random-SMTP-550-errors-for-inbound/... is hotting up again with mention of instances across servers for several brands.

@MJN Have you experienced further examples?


 

We've someone looking at the above right now.  Hopefully they are the same issue.  We'll see soon hopefully.

Kelly Dorset
Broadband Service Manager
thunderbird6
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Registered: ‎20-01-2018

Re: False rejection of valid sender domain

It's gone horribly quiet here, and on the other thread referenced above. But nothing has been fixed and the issue is back with a vengence over the last couple of days. Mail to PlusNet or PlusNet hosted domains is frequently (but not consistently) being bounced with 550 errors

Domain of sender address <xxxxxxx.xxxx.xx.xx> does not exist

 Perhaps I would have more success complaining to Waitrose since the issue affects their customers, amongst many others.

 

What has happened to internal investigation reference number : 105238 ?

Superuser
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Registered: ‎06-04-2007

Re: False rejection of valid sender domain

It has indeed gone very quiet on this topic and the other one https://community.plus.net/t5/Email/Plusnet-Email-servers-giving-random-SMTP-550-errors-for-inbound/....

I wonder if DNS is struggling to cope?

@Kelly Can a progress update be provided please?

David
Community Gaffer
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Re: False rejection of valid sender domain

Just checking the id, it looked like we'd resolved this, but obviously not.

Had it gone completely and just restarted?  Or was it still happening and it's just got a lot worse?

Kelly Dorset
Broadband Service Manager
Superuser
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Re: False rejection of valid sender domain

@Kelly This is not directly "No sender domain" error specific, but is possibly related.

Last night, and again this morning, on different computers, one wired, the other WiFi, nslookup said DNS lookup failed - Time out 2 seconds, but still gave valid IP answers. This was using router DNS queried at its IPv6 address. The router has 212.159.6.9 & 10 primary and secondary DNS set.. This struck me as queries being sent to both DNS, one not responding but the other did. I don't recall getting that error before last night.

David
thunderbird6
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Re: False rejection of valid sender domain

Hi Kelly,

Checking the logs it seems to have gone away from around mid December until earlier this week, since when it has been happening a lot again with exactly the same error message as before and on various PlusNet hosted services.

 

Let me know if you need specific examples and times.

 

Thanks for taking an interest in the problem.

Regards Keith

Community Gaffer
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Re: False rejection of valid sender domain

Hi, specific examples with dates and times would be great.

Could you also clarify what you mean by "and on various PlusNet hosted services."  

Kelly Dorset
Broadband Service Manager
Community Gaffer
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Re: False rejection of valid sender domain

@spraxyt @thunderbird6

 

I've got someone doing a bit of digging now.  Send over some examples of it if you can:  date, time, sender address and recipient address will help us finding stuff in the logs.  PM them over Smiley

Kelly Dorset
Broadband Service Manager
thunderbird6
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Registered: ‎20-01-2018

Re: False rejection of valid sender domain

Hi Kelly,

I have sent you a PM including a variety of examples. They actually show that the problem was still present at the end of December and during January, which negates what I said earlier about the problem having gone away for a while. My reference to "various PlusNet hosted services" is supported by examples from Waitrose, GlobalNet and domains hosted on force9/megamailservers.eu. I hope this helps you to track down the problem.

Regards

Keith

Community Gaffer
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Re: False rejection of valid sender domain

Yeah, that was great timing! Smiley

 

We're having a look.

Kelly Dorset
Broadband Service Manager