mailman POSTFIX_STYLE_VIRTUAL_DOMAINS

[David Southwell]

In mm_cfg.py
what is the correct syntax to follow when there are multiple 
POSTFIX_STYLE_VIRTUAL_DOMAINS to be identified extending for more than a 
single line??

e.g 
POSTFIX_STYLE_VIRTUAL_DOMAINS = [
virt1.ain
virt2.ain
etc
]
vaild or what?
are seperating commas required?
Is there an open/close bracket needed or '\' for end of line?

Thanks
david