Is -1 value in max.attachment.size.rules acceptable?

[Ed Ewing]

Hello all,

Will someone confirm if using "FromOrTo: default  -1" in 
max.attachment.size.rules is an acceptable value?
Have set limits for some domains and want the default to be no limit. 
Tried using "Maximum Attachment Size = 0" similar to the directive in 
max.message.size.rules (Maximum Message Size = 0) but MS gives a syntax 
error on reload.

Thank you.