[Boatanchors] What does this mean?

[D C _Mac_ Macdonald]

Then WHY does the mailman.qth.net system change plain ASCII text into a proportional text?
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* Oklahoma City, OK * 
* USAF, Ret'd 61-81 * 
** FAA, Ret'd 94-10 * 
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> To: boatanchors at mailman.qth.net
> From: wrcromwell at gmail.com
> Date: Wed, 6 Jan 2016 17:10:36 -0500
> Subject: Re: [Boatanchors] What does this mean?
> 
> Hi Doug,
> 
> Some (many?) mail reflectors do not allow HTML or other razzle-dazzle in 
> messages. Plain text only. File sizes expand dramatically with anything 
> beyond plain text. Quite a few do not allow image (graphic) file either. 
> If an image is included but the rest is plain text the text portion 
> might come through with images removed and a tag containing those words 
> in place of the picture.
> 
> 73,
> 
> Bill  KU8H
> 
> On 01/06/2016 04:50 PM, Doug Hensley wrote:
> >   "The message's content type was not explicitly allowed".