[gmx-developers] Mails rejected with "The message's content type was not explicitly allowed"

Szilárd Páll szilard.pall at cbr.su.se
Thu Jul 5 16:58:47 CEST 2012

I'm not an expert in fighting spam, but I wonder if this is really an
adequate solution. AFAIK a spam filter is what's meant to solve such


On Thu, Jul 5, 2012 at 3:24 PM, Rossen Apostolov <rossen at kth.se> wrote:
> Dear all,
> Recently the Gromacs mailing lists have been used for sending spam and
> viruses, and thus now only plain text messages are accepted.
> If you have received rejected mails saying "The message's content type was
> not explicitly allowed" it means that you have used in your mail special
> styles or formatting (e.g. bold typeface, colors etc.).
> Check your email client settings about how to send messages as plain text,
> e.g. in GMail make sure to click on "Compose -> Plain Text". Check also
> whether a formatted signature is added.
> Attachments are also not allowed but you could include links for downloads.
> Rossen
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