BlueMail offers a few ways to achieve this:
- You can quick tap on the avatar / image of a sender from the mail list, and you will see the option to Copy this contact.
- You can do the same from the mail view itself.
- You can long tap the sender (bold text) from the mail view and then Copy Email Address option.
- Lastly, and again from mail view, you can tap More Details, long tap any contact and then the Copy Email Address option.