New operator ?? can be used to make parts of an address header optional.

??name
??mail
??firstname
??lastname
??bracketMail(..)

the part will be omitted if other parts return something.

Example:

%from(name,??mail)%

If no name is given:

xyz.com  ==>  xyz.com

If name is given:

Fred <xyz.com> ==> Fred

Created an attachment (id=8542) [details]
1.6 prerelease 216

Test version. You can use ?? on any argument of 

%to(arg)%
%from(arg)%
%cc(arg)%
%bcc(arg)%
%reply-to(arg)%

Created an attachment (id=8545) [details]
1.6 prerelease 240

Added the possibility to add ?? as optional parameter to the bracketMail() /
bracketName() arguments.

If ?? is prefixed to any of the possible arguments of bracketMail, the bracket
expressions will only show up if other parts of the header expression exist

For instance 

%from(name,bracketMail(??angle))%

will display either
name <email>
when a name can be found, or 
email
when no name can be found and thus email is the only string returned. in this
case the angle brackets are omitted.

Resolved Completed: Version 2.0 - 23/12/2018