[n5bb]

Originally Posted by pjwalsh

Bill, how did you discover the undocumented extensions? What does notify 'app' do?

I saw these in the automatically generated sieve code for my main Fastmail account. I have my calendar linked to another calendar and use the Fastmail iOS app, so my guess is that those other features have to do with support of mobile devices and calendars. For example, this is in my sieve code:

### 6. Sieve generated for calendar preferences
if   
   allof(  
   header :is "X-ME-Cal-Method" "request", 
   not exists "X-ME-Cal-Exists",
   header :contains "X-Spam-Known-Sender" "in-addressbook"
   ) 
{
   notify :method "addcal";
} 
elsif exists "X-ME-Cal-Exists" {
   notify :method "updatecal"; 
}

It appears to me that this has to do with adding or updating calendar events found in iCalendar .ics attachments.

Bill