Summary

The issue is related to a set of characters followed by @ then another set of characters that turns into a link. Example: chdhvdvcdjk@vjkdbvjkdb will be seen as link. The issue is reproducible only on IE. Not affecting Chrome neither FireFox. See screenshot.

This is the storage format

<p>
  <a href="mailto:hfhfghf@gcdhgc">hfhfghf@gcdhgc</a>
</p>
<p> </p>
<p>jdj@dsf </p>

hfhfghf@gcdhgc was created in IE, so it was modiyed into an email link
jdj@dsf was created on Chrome. No link

Environment

IE 11 + Confluence 5.9 , 5.8

Steps to Reproduce

1. Create a page in IE, add a title
2. type abc@abc then hit space, you will see it changes into am email link

Expected Results

abc@abc without link format

Actual Results

abc@abc shows as a link

See screenshot for details