Rated 1 out of 5 stars

yazan: *MiG* tarih: Tem. 25, 2011 ·

..therefore I cannot evaluate it.
Any plan for an updated version?

This review is for a previous version of the add-on (0.4.1). 

yazan: vblavet (Geliştirici) tarih: Tem. 26, 2011 ·

SMTP Control version 0.5.0 supporting TB 5.0 is in the review process.
Preliminary review is done. Possible download in version list section : https://addons.mozilla.org/en-US/thunderbird/addon/smtp-control/versions/
Comments from AMO reviewer is linked to the use of enablePrivilege() function, use of password field in prefs (but not used in the current version - for future use) and use of setAttribute() for oncommand and onclick commands. I'm working on it.