[Exim] Strange connection time

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Autore: Paulo Henrique Baptista de Oliveira
Data:  
To: exim-users
CC: suporte
Oggetto: [Exim] Strange connection time
    Hi all,
    I have an exim server in a Debian Potato server.
    Some connection from some ISPs who the hello message in a few seconds
and others have to wait 30 sec for smtp message.
    What can be wrong? Confs? DNS?
    TIA,        PH