[Exim] Complex SMTP AUTH (LOGIN)

    I need do complex SMTP AUTH (LOGIN) and in server_condition I want to do
next:

    $1 - user name; $2 - password

    if ($1 not contains '@')
    {
        # standart, system check
        crypted check in /etc/passwd
    }
    elseif (exist file /somewhere/${domain:$1}/passwd)
    {
        # virtual domains check
        not crypted check in /somewhere/${domain:$1}/passwd
    }

    Is it possible and how can I do this?

    Thanks.

    Dmitry Shikut, shikut@???