[Osia-members] AGM and Stepping Away

[Paul Foxworthy]

Hi all,

I have run into a similar thing with a customer where the attachment was
PDF and the MIME type said octet-stream. Their system has been working for
years, but Google started bouncing these messages sometime in the last few
weeks.

Cheers

Paul



On 27 November 2017 at 15:58, Jack Burton <jack at saosce.com.au> wrote:

> On Mon, 27 Nov 2017 15:26:25 +1100
> Nick Moore <nick at mnemote.com> wrote:
> > I'm on fastmail: their headers indicate that it was received with
> > valid SPF and a Spam score of 0.0.Gmail can be greatly mysterious at
> > times.
>
> In general I agree, but in this case I suggest that gmail was doing the
> right thing.
>
> The message in question had an attachment of type application/gzip that
> had a file name ending in ".zip" (instead of ".gz").
>
> On platforms where magic numbers are ignored in favour of legacy
> filename extensions (principally Windows & VMS), a MIME type / file
> extension mismatch in a mail attachment is a common sign of a nefarious
> sender.
>
> Rather than waste cycles scanning the content of such suspect
> attachments, many large scale mail systems that expect to have Windows
> (or VMS) users simply reject.
>
> After all, if it's not nefarious, it's almost always an error anyway
> (as was presumably the case here).
>
> So I don't think gmail was at fault in this case (although I've seen
> plenty of others where it was).
>
> One such bounce could easily be overlooked or mistaken for a member
> who'd simply forgotten to advise of a change to his email address.
>
> A whole bunch of them (oddly, quite a number of OSIA members use Google
> for their mail hosting, so I assume the number of bounces would have
> been non-trivial) on the other hand would seem pretty hard to ignore...
>
> Personally I was *not* affected (we host our mail in-house), but I've
> heard a few reports off-list today (in addition to those seen on-list)
> of members who were affected.
>
> Regards,
>
>
> --
> Jack Burton FACS CP <jack at saosce.com.au>
> Director, Saosce Pty Ltd
> Company Secretary, Safecoms Cyber Security Pty Ltd
> --
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>



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