Comparator

The notify_method_capability test retrieves the notification capability for given method and matches it to the given values.

The capability parameter is case insensitive. Currently only a single capability "online" is defined. But Sieve Notifications extensions may add aditional capabilities.

The "online" capabilities result is either "yes", "no" or "maybe". And describes the likelyness for a successfull delivery.

Note that even after a "yes", there is no guarantee when and if the notification is received. Transport errors, recipient policy, etc. can prevent that.