Topic on Extension talk:Echo

hello,

In my wiki when the user chose $wgDefaultUserOptions['echo-email-frequency']=1 (so send mail each day) the user doesn't receive but if the user put $wgDefaultUserOptions['echo-email-frequency']=0 (so immediately) he receives the mail, so I have 2 questions.

for each day what time of the day ?

and why don't the user receive?

I test with the Extension:EditNotify maybe it come from here ?

thanks.