552 Errors from PlusNet

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Richard Porter

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Feb 20, 2021, 11:07:42 AM2/20/21
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Does anyone else get this problem with PlusNet/Messenger Pro/POPstar?

From time to time the server fails to accept an outgoing message which I
have bounced to another mailbox that I read on my iMac (because of things
that aren't supported on RISC OS). The server immediately rejects the
message giving a 552 error thus (from POPstar log):

18 Feb 14:21:56 030 Server failed to accept body of message 01
18 Feb 14:21:56 030 552 CkBmlXimzgDOHCkBnl6iaZ message rejected due to
spam or virus. If you believe this is in error please login to your portal
or contact your ISP support team.

The messages in question have come in without being tagged as spam and I
am bouncing them straight to another mailbox in my PlusNet subdomain.

When I raise a ticket with PlusNet they deny knowing what the problem is
but messages miraculously start flowing again! Until the next time.

So I did some investigation. The error seems to be triggered by a link in
the body of message which if I remove it the message is accepted, but then
the message is no longer any use. I also noticed that when I edited the
outgoing message changing the original To: address to the new destination
the message will go.

I can zip the outgoing message which gets accepted but there's another
issue. If I open the archive on the Mac the messages open in Mail, not
Messenger Pro.

Apologies if I've posted this before but it's been going on for some time.
I'm suspecting (but have no proof) that PlusNet is turning the faulty
filter off for my IP address, then some time later somebody else comes
along and does a security audit and turns it back on again.

Martin

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Feb 20, 2021, 11:52:04 AM2/20/21
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In article <8afed00...@user.minijem.plus.com>,
Richard Porter <ri...@minijem.plus.com> wrote:
> Does anyone else get this problem with PlusNet/Messenger
> Pro/POPstar?

I use Force9 (ie Plusnet), Pluto, and AntiSpam (MSC)

> From time to time the server fails to accept an outgoing message
> which I have bounced to another mailbox that I read on my iMac
> (because of things that aren't supported on RISC OS).

I somethimes bounce stuff from RISC OS to my laptop.

> The server immediately rejects the message giving a 552 error thus
> (from POPstar log):

> 18 Feb 14:21:56 030 Server failed to accept body of message 01
> 18 Feb 14:21:56 030 552 CkBmlXimzgDOHCkBnl6iaZ message rejected due
> to spam or virus. If you believe this is in error please login to
> your portal or contact your ISP support team.

Just checked MSC logs (from Dec 2020 onwards), and can find no trace
of similar messages. Before MSC I used POPstar for years, and cannot
remember seeing anything similar.

> The messages in question have come in without being tagged as spam
> and I am bouncing them straight to another mailbox in my PlusNet
> subdomain.

Just as I do sometimes.

[Snip]

But no help to you, as it has not affected me, sorry.
Your suggested causes sound possible, but I never heard of it
happening. Can you set up an artificial one that you send every week,
and see if/when it fails?

Martin

--
Martin Avison
Note that unfortunately this email address will become invalid
without notice if (when) any spam is received.

druck

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Feb 20, 2021, 3:47:12 PM2/20/21
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On 20/02/2021 16:00, Richard Porter wrote:
> Does anyone else get this problem with PlusNet/Messenger Pro/POPstar?

> The messages in question have come in without being tagged as spam and I
> am bouncing them straight to another mailbox in my PlusNet subdomain.
>
> When I raise a ticket with PlusNet they deny knowing what the problem is
> but messages miraculously start flowing again! Until the next time.

Yes I have this quite frequently. PlusNet have some sort of detection
for open email relays, and resending an identical copy of commercial
looking email (usually html with links), will trigger it. I normally
just forward the email in plain text, which usually works, although I'm
sure there was one recently which refused to go even with this.

---druck

Steve Fryatt

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Feb 22, 2021, 5:35:03 PM2/22/21
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On 20 Feb, Richard Porter wrote in message
<8afed00...@user.minijem.plus.com>:

> The messages in question have come in without being tagged as spam and I
> am bouncing them straight to another mailbox in my PlusNet subdomain.

Is it a DMARC issue? If so, it would need the sender of the bounced mail (or
their mail provider) to have things configured in a certain way -- which
could easily explain the randomness of the problem.

--
Steve Fryatt - Leeds, England

http://www.stevefryatt.org.uk/

Richard Porter

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Feb 27, 2021, 6:33:32 AM2/27/21
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The date being 22 Feb 2021, Steve Fryatt <ne...@stevefryatt.org.uk> decided
to write:

> On 20 Feb, Richard Porter wrote in message
> <8afed00...@user.minijem.plus.com>:

>> The messages in question have come in without being tagged as spam and I
>> am bouncing them straight to another mailbox in my PlusNet subdomain.

> Is it a DMARC issue? If so, it would need the sender of the bounced mail (or
> their mail provider) to have things configured in a certain way -- which
> could easily explain the randomness of the problem.

I don't think it's a DMARC issue. DMARC creates all sorts of problems for
AoL subscribers on mailing lists but this is different. More likely DKIM
but I don't understand how that works!

Steve Fryatt

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Feb 28, 2021, 10:35:03 AM2/28/21
to
On 27 Feb, Richard Porter wrote in message
<f9b0520...@user.minijem.plus.com>:

> I don't think it's a DMARC issue. DMARC creates all sorts of problems for
> AoL subscribers on mailing lists but this is different. More likely DKIM
> but I don't understand how that works!

DKIM is just one of the technologies that makes up the wider collection
known as DMARC. SPF is the one that causes more visible issues for
badly-configured mailing lists, but DKIM can also show up a number of
problems.

To be honest, from your description, I was guessing that SPF could be worth
looking at for the cause.

Chris Evans (CJE/4D)

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Mar 4, 2021, 11:56:16 AM3/4/21
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In article <s0rsgf$glu$1...@dont-email.me>, druck
We quite often get this with Plusnet here when trying to bounce (To a
Windows computer) emails we receive.

Scenario often is:
We get a spam email from what seems a valid company that includes an
unsubscribe link [1] which will not work in a RISC OS browser. So we try and
bounce it to my Windows 10 laptop

[1] Unsubscribing does seem to work most times. I know some people think you
shouldn't unsubscribe as that tells them they have a live email address but
I think the upside of actually being unsubscribed most of the time worth it.
Any email that is obviously 'phishing' I don't try unsubscribing too.

i.e. plusnet antispam outward filters are more effective than their incoming
filters.

Chris Evans

--

****** IGEPv5: The fastest RISC OS computer so far! *******
------------ http://www.cjemicros.co.uk/igepv5 ------------
CJE Micro's 'Raspberry Pi & RISC OS Specialists'
Tel: +44 (0)1903 523222
ch...@cjemicros.co.uk http://www.cjemicros.co.uk/
Unit 16 Arunside Ind. Est., Fort Road, Littlehampton, W.Sussex BN17 7QU

Don't let the urgent things in life, crowd out the important things!

Richard Porter

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Mar 4, 2021, 5:06:58 PM3/4/21
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The date being 4 Mar 2021, "Chris Evans (CJE/4D)" <ch...@cjemicros.co.uk>
decided to write:

> In article <s0rsgf$glu$1...@dont-email.me>, druck
> <URL:mailto:ne...@druck.org.uk> wrote:
>> On 20/02/2021 16:00, Richard Porter wrote:
>>> Does anyone else get this problem with PlusNet/Messenger Pro/POPstar?
>>
>>> The messages in question have come in without being tagged as spam and I
>>> am bouncing them straight to another mailbox in my PlusNet subdomain.
>>>
>>> When I raise a ticket with PlusNet they deny knowing what the problem is
>>> but messages miraculously start flowing again! Until the next time.
>>
>> Yes I have this quite frequently. PlusNet have some sort of detection
>> for open email relays, and resending an identical copy of commercial
>> looking email (usually html with links), will trigger it. I normally
>> just forward the email in plain text, which usually works, although I'm
>> sure there was one recently which refused to go even with this.

> We quite often get this with Plusnet here when trying to bounce (To a
> Windows computer) emails we receive.

> Scenario often is:
> We get a spam email from what seems a valid company that includes an
> unsubscribe link [1] which will not work in a RISC OS browser. So we try and
> bounce it to my Windows 10 laptop

[snip]

In my case I'm usually forwarding messages from Rail Technology Magazine
which are full of links to articles on their web site. Some of these items
don't display in NetSurf. The messages definitely aren't spam.

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