Wild guess: If Outlook changed your text-only default to HTML to match the
item to which you replied, and your HTML mail format is set up (as many are,
these days) to include a JPEG logo in the signature, you'd get this result.

That's not necessarily the only scenario--just the one that first came to
mind.

I've pretty much given up on policing attachment types. I tried, years ago,
but list users kept coming up with new, different file types (or new,
different MIME encodings for the same old file types) and it ended up
disrupting communications. I suspect any restriction on JPEGs these days is
probably left over from the simpler, more straightforward days of yore--like
five or six years ago.

Hal Keen

--------------------------------------------------
From: "Russell Hunt" <[log in to unmask]>
Sent: Thursday, November 02, 2017 12:57 PM
To: <[log in to unmask]>
Subject: [LSTOWN-L] blocked attachments

> This isn't actually a LISTSERV question, but it occurred to me that list
> owners might have encountered this and have a solution.
>
> Twice recently I've replied to postings on a list I subscribe to and had
> them rejected, with this error message.
>
> Your  posting to  the C18-L  list  has been  rejected because  it contains
> an attachment of type 'IMAGE/JPEG'. The C18-L  list has been
> configured to reject such attachments.
>
> I've been inspecting the messages (or, anyway, the most recent one) and I
> can't find any trace of an attached jpeg. I suspect that it's something to
> do with my mail client, which is Outlook (not my choice), running off the
> Web. It has the deplorable habit of attaching winmail.dat files to my
> mail, or burying pdfs in such files, which are unopenable unless your
> correspondent is also running Outlook. It also tends to pick up
> characteristics of emails you're replying to -- so although I've set my
> system to send text only, when I reply it seems to assume I want to
> emulate whatever I'm replying to.
>
> However, the message I'm replying to can't very well have had an attached
> jpeg, or the list would have bounced it. Anybody else run into this? It
> strikes me as odd that I've not had any complaints about it from the lists
> I own. Or maybe it's happening only to me, and something I could fix.
>
> -- Russ
>
> Russ Hunt
> Professor Emeritus of English
> St. Thomas University
> http://www.stu.ca/~hunt
>
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