Plusnet Email servers giving random SMTP 550 errors for inbound emails
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Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
23-12-2018 5:51 PM
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Agreed … if the software supplier will accept that the issue is a "defect" and deployment of that modified version of software is viable having taken into consideration other changes which might ship with that fix.
If it were to be the case that here we are looking at a DNS look up query failure (rather than a success reporting domain not known) then it is disappointing that the calling code does do discern the difference here and take a more appropriate course of action, rather than treating a generic failure event to imply the domain does not exist.
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Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
23-12-2018 5:58 PM
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If this is an issue with third-party equipment then I am surprised that my client has never ever seen it with anything other than the PlusNet hosted email addresses out of the >10k different members that they regularly email.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
15-01-2019 10:29 AM
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The weeks roll on and Plusnet continue to ignore this.
Another Plusnet customer doesn't receive another email from a valid domain:
From: "Mail Delivery System" <Mailer-Daemon@xxx> To: xxx Sent: 15/01/2019 08:08:41 Subject: Mail delivery failed: returning message to sender This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: xxx.xxx@xxx.plus.com host mx.avasin.plus.net [212.159.8.200] SMTP error from remote mail server after MAIL FROM:<xxx.co.uk> SIZE=14495: 550 #5.1.8 Domain of sender address <xxx.co.uk> does not exist
I resent this email. But I wonder how many people don't bother, resulting in Plusnet customers missing email. Thousands per day perhaps?
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
15-01-2019 5:16 PM
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Hi, I just started a new thread on this and staff member BD thankfully pointed me to this thread, I hadn't realised this was an ongoing problem.
I've not read every post, for me I didn't realise the emails were bouncing until today from other people until someone told me, but I have had problems SENDING emails from my domain the last while, and if I retry it normally works. Are others aware of/seen this? So it sounds like same problem and a similar "component", I'd suggest? My email client randomly says an error basically of "this sender domain does not exist" = exactly same.
Until they fix it I'd suggest a quick botch "fix" is to not immediately reject emails out hand for this error, but instead retry failed emails X times (perhaps with a delay), preferably trying different DNS servers (if they have this distribured ) to see if it is one of them that is broken? Log any of those that failed and then those that worked to see if there is a pattern?
Workaround it AND diagnose it.
It's not a nice problem as it not only means I might miss emails it sends my plusnet details back to the original sender.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
15-01-2019 7:21 PM
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Thanks for the update and suggestions, @Kwak.
I'll check in with our projects team tomorrow and see if there's any further update on this.
Best wishes
Dave
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
15-01-2019 10:35 PM
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I can also confirm that this is still happening and provide examples if you still need more. These failures are blocking automated messages to Plusnet mail accounts (order acknowledgements, etc.) which can't be set to automatically re-send as the NDRs go back through a separate route to be manually checked.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
15-01-2019 10:42 PM
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If it WAS to be treated as spam for some reason, why isn't it going into a spam folder?
(Talking of bad spam filters I had to laugh the other day when I logged onto a rarely used outlook account to see Microsoft putting its own emails into the junk folder ;))
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
15-01-2019 11:05 PM
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It isn't an issue of mail being treated as spam, it is a very specific rejection of the mail due to a failure of the Plusnet systems to successfully validate a perfectly valid and correct domain name.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
16-01-2019 11:07 AM
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Hello Guys,
We are still investigating the issue and currently don't have an update at the moment. I am really sorry and appreciate all the suggestions you have put forward.
Please bear with us.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
16-01-2019 11:09 AM
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I suspect the later!
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
16-01-2019 11:31 AM
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Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
16-01-2019 2:32 PM
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If it were that easy it would have been fixed a long time ago. This has all the hallmarks of a timing issue somewhere in the network.
There are indeed a multitude of DNS server instances … all behind intelligent network switches and load balancers. It would be presumptuous to assume that this is a straight forward DNS look up "mistake".
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
24-01-2019 11:14 PM
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Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
25-01-2019 9:35 AM
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This problem badly affects systems using automated mail. We manage an ecommerce site for one of our clients and PlusNet users frequently don't receive order acknowledgements or confirmations due to Plusnet bouncing them (they are not re-sent). The users then message the site to complain that they haven't received any confirmation, which creates extra admin, but of course there is a random chance (generally much worse than 50%) that they don't receive the response either. After a couple of rounds of this the Plusnet (non)recipient is usually getting understandably angry and concerned that they have been scammed and threatening all sorts of bad reviews and retribution. The site owner then gets understandably annoyed with us for not fixing the problem and Plusnet just continue to say for 14 months now that they are looking into it. If we could actually successfully send a message to all of the site's users with Plusnet hosted addresses we would advise them to find a more responsive ISP at their earliest opportunity.
Re: Plusnet Email servers giving random SMTP 550 errors for inbound emails
on 25-01-2019 2:27 PM - last edited on 26-01-2019 12:19 PM by Mav
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If it's something timing out, then increase the timeout? And add doing retries on failure? I'm struggling to understand why they can't attempt to fix this, These would be standard workarounds to atttempt for a random error as an attempt to mitigate it? It seems to be a very repeatable (but random) error, repeatable in that it shows the same symptoms and we know it's intermittent so an internal retry would hopefully fix it? I've been mostly concerned here with forwarded emails being bounced that are translated via "my domain" (as that's how the forwarded email works and most of my emails are throgh my domain) but I've realised it might be totally general and affect every email for all users which is a HUGE problem? But if it isn't, can't plusnet say cache all users with known domains routed through plusnet as a first level lookup (or tagged on as a backup lookup upon failure) that'll be a very speedy check if the domain is valid? The list of domains plusnet have to deal with will for their customers with domains will of course be a tiny fraction of all domains. PS I tried whitelisting domain in spam settings, made no difference.
Can they not just switch off the check completely or put it in our junk folder, or allow whitelisting? How much BAD email does it actually help reject anyway? I think users would all rather have a little more spam than have what seems to be a relatively high ratio of valid email totally thrown away
Moderator's note by Mike (Mav): Post released from Spam Filter.
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