I've successfully installed Post by email Pro on my site . Everything seems to work with one exception:
The display of the articles in an IE 11 browser is distorted.

Using Joomla! Prostar template, Blog Category for articles in category News.

Post-By-Email inserted <hr id="system-readmore" /> tags larger messages.
Viewing the News Blog page with the Read More button displayed, makes the menu items in position 7 --right appear to wrap to the bottom of the page.

When I open the full view of the article, the menu items in postion 7 --right correctly appear in the right side position on the page.

This is not a problem in FireFox or Safari.

Is there anyway for me to control the <hr id="system-readmore" /> tags when emails are imported?
Any other ideas?

Hello. Post-By-Email does not change html code. What is inside your email, this will be imported in your website. And this html code can broke your site html.

You can use option strip html tags and extension will import only clear text. Or you can try to insert (with option "insert after content") inside every inserted in content email something like:

or

Sorry, but I disagree. I found a method to control it however in another post. I set the introtext size [words] to 1000 (or more). It will still insert the HR tag on larger messages.