Duplicate of request #8784.

Also worth mentioning:
The require line has to be changed to require "enotify" instead of 
"notify", for example:
require ["enotify", "relational", "comparator-i;ascii-numeric"];

When using ingo with dovecot-2.0 (beta 4) I found that ingo works 
great except for the notify action. Dovecot uses the new enotify 
action and (by default) the old notify action is disabled by default.

Thus creating a rule with a notify action leads to this error:
There was an error activating the script. The driver said: 
{204}webmail: line 4: error: require command: unknown Sieve capability 
'notify'. webmail: line 8: error: unknown command 'notify' (only 
reported once at first occurence). webmail: error: validation failed.

The new enotify syntax is as follows (basic example):
notify :message "You have received a new message" 
"mailto:someone@example.com";