I've always used this style for args:
in reply to Re: Re: Re^2: There's a level in Hell reserved for ________
in thread There's a level in Hell reserved for ________
And for really long ones that would wrap, I do something like this:
Keeping each arg on a separate line makes them easy to read and easy to change, in my opinion. It is the most common style I've seen in use by experienced Perl programmers.