Custom fields of type URL interpret any URL with a mail address in it as mailto:

Issue Summary

When using a custom field URL and the user paste an web link that contains `authuser= <useremail>`on the URL body, if the user clicks on the link, it is opening a new email box with 'mail to:' instead of opening the web page.

As an example of a URL that contains `authuser= <useremail>`, you can use for test the google drive link: https://drive.google.com/.....authuser=<useremail>.../.

Steps to Reproduce

1. Add the URL custom field in the issue type screen.
2. Paste the following link on the URL custom field:  https://drive.google.com/.....authuser=<useremail>.../
3. Open the URL.

Expected Results

It should open the link posted on the ticket

Actual Results

When clicking in the link, it opens an email box.

Workaround

To avoid custom URL values containing @ from being interpreted as mailto:, the '@' character must be URL encoded. For the '@' symbol, this is '%40'.

As another option, you can create a text field (multi-line) and configure the Wiki render.