Autolink will misfire

```
via @extensions.achook.staticConfig.domain@. This
```

will convert to

```
<p>via @<a href="mailto:extensions.achook.staticConfig.domain@">extensions.achook.staticConfig.domain@</a>. This</p>
```

I don't expect this result.

Smaller example.

```
n@.  b
```

will convert to

```
<p><a href="mailto:n@">n@</a>. b</p>\n
```

`n@` is invalid email address.
