Show full email address when mouse over sender

[abruenin]

Sometimes it is not so easy to identify spam in the inbox. The subject and the sender look OK and only when I click on the mail to open it, I can see the email adress to identify spam.

It would be helpfull to see the full sender address when mouse over the sender in the inbox. Even better, when a spam button would be directly included with the mouse over bubble with the full email.

[slack000]

I think it's not the right approach. Full email address must be displayed ALWAYS as it is the only real identifier. Hiding email by default requires the reader to take an extra step to reveal the email behind sender's name, meaning that in most cases this step will never be taken. Secure by design requires true email identity to be disclosed first and all other names and nicks after that. 
Thanks

[Aleca]

Goo news, we already implemented this and you can fully control how it behaves!

In the Settings > General, you can choose how the message list should behave and visualize the data in for the Sender.

We also added an option that doesn't show the email address if the contact is saved in your address book, so it's much easier at a glance to identify if an email is coming from someone you know, or someone that tries to impersonate a known contact.

[wsm]

This ended up being delivered via https://bugzilla.mozilla.org/show_bug.cgi?id=243258 for version 128. 

Thanks for all the votes and support.