Email highlighting breaks code blocks

## Issue Description

If inserting text like,
```
Some text with an `email@address.com` and a following `code block`
```
is inserted to the text, it is not parsed correctly:


Adding a leading space to the
```
` email@address.com`
```
causes it to correctly wrap the email as code, but I believe that putting `` around text should prevent it from being auto-highlighted into an email. GitHub and Slack both render the email as a code block with no hyperlink, as I have come to expect.

## Steps to reproduce:

Paste the markdown above containing an email into H2; save and publish, or even preview, and see that the email address breaks the code backticks.

## Expected Result:

Text within backticks would not get treated as an email hyperlink.