exim queue fulling up

i have one question about the option in Main >> Service Configuration >> Exim Configuration Editor:

if i mark the option:
Discard emails for users who have exceeded their quota instead of keeping them in the queue.


What going to happen ? can some one explain a little better what happen without it marked and with it marked please ?


[ just some adds ] but i didnt test it , i want to hear what happen first.
1. the user with mailbox full will not receive it and my server will delete it and send a message to the sender telling the mailbox if full ?

2. the user with mailbox full will not receive it and my server will delete it without warns ?

3. it will keep in the queue in order to delivery to the user with mailbox full when space is free ?

note: i am using this set of configuration http://www.rvskin.com/index.php?page=public/antispam

and my users with mailbox full get their new emails as queue to delivery.

thx in advance.

 

mmm i were looking in that path manually just for checking and i found for example:

domain1.com

so i did cat domain1.com and it showed
*: domain1

then i did the same with domain2.com and it showed:
*: :fail: No Such User Here

are both right or domain 1 is wrong ?

when i installed your dictionary i did use the comand to switch from black to fail.

thx :D

 

well its working fine domain 1 ...

would i get any problem if i just switch for fail ?

or its better leave how it is.