Ah, I see. These messages are being generated by a Drupal site and sent to
the ListServ so I suspect it's not creating plaintext versions.

Is it possible to turn off the digest option for a ListServ / convert all
existing subscribers to "Regular"?
Or is it perhaps possible to make the digest go out HTML email synopsis?

Krista

On Mon, Jan 30, 2023 at 4:09 PM Jacob Haller <[log in to unmask]> wrote:

> > What would cause this error in a Digest message but not in the an
> individual post to a List?
> >
> > [Message contains invalid MIME fields or encoding and could not be
> processed]
> >
> > Krista Landon
>
> Basically, when LISTSERV puts together a plaintext digest, it discards
> everything in the message that isn’t plaintext. If, at the end of that,
> there’s nothing left, then you get this error. (The error might also show
> up in other circumstances, if some other error occurs while LISTSERV is
> attempting to parse the message to put it in the digest.)
>
> My guess is that the message in question was either an HTML message that
> did not include a plaintext version of the message, or was a message that
> just consisted of an attached document. Most email programs automatically
> generate and include a plaintext version of an HTML message, and contain at
> least a blank plaintext part of messages containing attachments, so this
> sort of error is rare.
>
> The default wording of the message doesn’t specifically address that
> scenario, but if you want, you can customize it under ‘List
> Management’/‘Mail Templates’ (to customize it for a specific mailing list)
> or ’Server Administration’/‘Mail Templates’ (to customize the default
> site-wide version). The template’s name is MSG_DIGEST_FRAGMENT_MIME_ERROR.
>
> Thanks,
> jwgh
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