exchange server2000

Hello
 
We have a problem with our exchange windows 2000 that is behind the ISA
server
Receiving email from outside no problem at all.
But we have problems for sending email, some times the email arrive to
destination after2 minutes Some time after 1h , 5hs,or the next day.
Could you please help me, what I must do exactly to our ISA server or
what is the problem?
 
 
Hanan.Mawla
(MCSE,MCT,CCNP)
 

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