Wv> What is/are the setting(s) in mystic to have it poll (almost)
 Wv> immediately, when there is anything to deliver to connected nodes?
 Wv> 
 Wv> I have a connection to a mystic node that is struggeling with this...

Same as anything else, really.  When echomail is ready a semaphore file is
created.

If they are using all Mystic components then they can create a Semaphore
listening event in Mystic to wait for the semaphore and then execute Mystic's
tosser/send functions.  The default install has example events for this, but
maybe looking at some video tutorials would be more helpful:

https://www.youtube.com/watch?v=o_jn-xhqaKs

It really depends on what software they're using.  Mystic doesn't require you
to use Mystic's tosser or mailer, or even its terminal servers... you can use
whatever you want.  A configuration of course depends highly on what they're
using.

--- Mystic BBS v1.12 A36 (Windows/32)