[Exim] Multiple questions

I have multiple questions:

- How to deny "sender_domains" of "+local_domains : +relay_to_domains" only for
MX?
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deny   log_message   = "DENY - Auth - $sender_host_address is external and auth
is forced"
    message        = Auth first to send from internal domain
($sender_address_domain)
    #condition     = ${if match {$sender_host_address}{${lookup
dnsdb{MX=$sender_address_domain}{$value}fail}}{no}{yes}}
    # !hosts       = ${sg { ${lookup dnsdb {MX=$domain}}} {\n}{ }}
    sender_domains = +local_domains : +relay_to_domains
    senders        = !:
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Hot to crate a online bd for denied "Helo forged hostname detected" and reject
connection of these for 24hours????
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acl_connect:
   #drop   once1d  = hostsblocks.db

acl_helo:
  drop   log_message    = "DENY - Helo - $sender_host_name forged hostname
detected"
         message        = No you are not ME or OURS (HOSTNAME was
$sender_helo_name)
         condition      = ${if and {\
                    {!eq{$sender_host_name}{}}\
                    {match{${lc:$sender_host_name}}{${lc:$qualify_domain}}}}\
                    {yes}{no}}
    #includebd  = hostsblocks.db
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How to deny hosts if "helo name" is change for period < 6hs??? Have a clause
"helo_cached???" How to consulte db of exim??? (helo, callout etc???)

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