Text only emails wrongly detects emails and converts them into broken links

In mails written in plain text format, the presence of the @ character within a line is treated as a link of this type URL:

https: //<server_name>/webtop/text@text

Steps to reproduce:

• send to your account a mail in plain text format that contains only this line: text@text
• open the email received and click on the text received

 Expected behaviour:

• the text is converted into a correct onclick link to a compose email window with that recipient

Actual behaviour:

• the text is clickable and is converted with this URL:

  https://<server_name>/webtop/text@text

Thanks to Nicola Remedi (Internal Ref: #92688)