When no Name Portion is given in an Email Address, currently SmartTemplate4
tries to "guess" the name from the beginning part of an email address (the part
before the '@' sign)

Add an option for disabling this behavior. This means that
1) when using %to% no Name portion is added unless it can be found in Name /
Display of the Address Book

2) when using arguments for parts like

%to(name)%
%to(firstname)%
%to(lastname)%

will return an empty string in this case.

%to(name,mail)% will then only return an email address.

Created an attachment (id=8540) [details]
1.6 prerelease 208

To disable name "guessing" open about:config and toggle

"extensions.smartTemplate4.names.guessFromMail=falsee

Created an attachment (id=8543) [details]
1.6 prerelease 216

previous version only worked in certain cases. This one is better tested and
works with:

%to% 
%to(name,bracketMail())%
%to(name)%
%to(firstname)%
%to(lastname)%
%to(mail)%
%to(name)% <%to(mail)%>
%cc(name,bracketMail())%