Stop Outlook from removing spaces (character spaces not line spaces)

We are running in to a new issue in Outlook.  Our standard formatting is to have 2 spaces after a colon or a period at the end of a sentence.  Our Outlook message format is HTML.  Our assistants prepare draft emails and drag them to a folder in their attorneys mailbox.  When the message is opened in the Attorneys mailbox there is only space after a colon or period.  All double spacing has been removed.

Frontend is Outlook 2010 or 2016
Backend is Exchange 2016

Has anyone seen a setting that can prevent this modification to the message?
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NerdsOfTechTechnology ScientistCommented:
If it is html-based try two   (non-breaking spaces) instead of spaces. HTML ignores but the first white space.

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Dave BaldwinFixer of ProblemsCommented:
All double spacing has been removed.
HTML always does that.
NerdsOfTechTechnology ScientistCommented:
To prevent HTML encoding of    --- You can render a non-breaking space (hereinafter "nbsp") by pressing and holding Left Alt+ NUM PAD 2, NUM PAD 5, NUM PAD 5, then let go of Left Alt (nbsp is the last character of extended ASCII). Do this twice or have two of these characters in a row saved in a file for the assistants to copy from (when they get to a mark they can Ctrl+V it into the document in the latter case and have this saved in their clipboard).

" " doesn't look much different than " " but they are... (copy and paste the first one)

One caveat besides forcing the archaic double-space format is that, although the nbsp (non-breaking space) will always render as many times as you want, it will NOT break the line like a regular space would so expect the next word to share the same line as the nbsp's and punctuation mark prior.  
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William FulksSystems Analyst & WebmasterCommented:
If you are required to have specific formatting, doing it within email is a bad idea. You should be putting that into Word documents, or PDF's, and then sending them as attachments via email. Otherwise you will continue to have problems because some people change their fonts, etc.

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NerdsOfTechTechnology ScientistCommented:
The solution by @William seems to be the best solution here. Use attachments to keep the special formatting intact as HTML will parse extra whitespace as a single whitespace.
William FulksSystems Analyst & WebmasterCommented:
Thanks! Glad to help.
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