Hi ZHB, i already created new topic..my main issue right now is when i add my secondary domain which is "uniorient.net" in /etc/amavisd/amavisd.conf then after adding i restarted the amavisd it has an error come out and it won't start the service.
but my main domain theres no any issue and its working fine with the amavisd which is "bluecrossphilippines.com"
here's the output error of amavisd:

● amavisd.service - Amavisd-new is an interface between MTA and content checkers                                                                             .
   Loaded: loaded (/usr/lib/systemd/system/amavisd.service; enabled; vendor pres                                                                             et: disabled)
   Active: failed (Result: start-limit) since Tue 2016-03-15 07:37:02 PHT; 15s a                                                                             go
     Docs: http://www.ijs.si/software/amavisd/#doc
  Process: 5686 ExecStart=/usr/sbin/amavisd -c /etc/amavisd/amavisd.conf (code=e                                                                             xited, status=2)
Main PID: 3826 (code=exited, status=0/SUCCESS)

Mar 15 07:37:02 mail.eurogroup.com systemd[1]: amavisd.service: control process                                                                              exited, code=exited status=2
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: Failed to start Amavisd-new is an                                                                              interface between MTA and content checkers..
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: Unit amavisd.service entered fail                                                                             ed state.
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: amavisd.service failed.
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: amavisd.service holdoff time over                                                                             , scheduling restart.
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: start request repeated too quickl                                                                             y for amavisd.service
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: Failed to start Amavisd-new is an                                                                              interface between MTA and content checkers..
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: Unit amavisd.service entered fail                                                                             ed state.
Mar 15 07:37:02 mail.eurogroup.com systemd[1]: amavisd.service failed.

note: my serverhostname is mail.eurogroup.com

here's the screenshot of my /etc/amavisd/amavisd.conf

# Add dkim_key here.
dkim_key("bluecrossphilippines.com", "dkim", "/var/lib/dkim/bluecrossphilippines.com.pem");
dkim_key("uniorient.net", "dkim", "/var/lib.dkim/uniorient.net.pem");
# Note that signing mail for subdomains with a key of a parent
# domain is treated by recipients as a third-party key, which
# may 'hold less merit' in their eyes. If one has a choice,
# it is better to publish a key for each domain (e.g. host1.a.cn)
# if mail is really coming from it. Sharing a pem file
# for multiple domains may be acceptable, so you don't need
# to generate a different key for each subdomain, but you
# do need to publish it in each subdomain. It is probably
# easier to avoid sending addresses like host1.a.cn and
# always use a parent domain (a.cn) in 'From:', thus
# avoiding the issue altogether.
#dkim_key("host1.bluecrossphilippines.com", "dkim", "/var/lib/dkim/bluecrossphilippines.com.pem");
#dkim_key("host3.bluecrossphilippines.com", "dkim", "/var/lib/dkim/bluecrossphilippines.com.pem");

# Add new dkim_key for other domain.

@dkim_signature_options_bysender_maps = ( {
    # ------------------------------------
    # For domain: bluecrossphilippines.com.
    # ------------------------------------
    # 'd' defaults to a domain of an author/sender address,
    # 's' defaults to whatever selector is offered by a matching key

    #'postmaster@bluecrossphilippines.com'    => { d => "bluecrossphilippines.com", a => 'rsa-sha256', ttl =>  7*24*3600 },
    #"spam-reporter@bluecrossphilippines.com"    => { d => "bluecrossphilippines.com", a => 'rsa-sha256', ttl =>  7*24*3600 },

    # explicit 'd' forces a third-party signature on foreign (hosted) domains
    "bluecrossphilippines.com"  => { d => "bluecrossphilippines.com", a => 'rsa-sha256', ttl => 10*24*3600 },
    "uniorient.net" => { d => "uniorient.net", a => 'rsa-sha256', ttl => 10*24*3600 },
    #"host1.bluecrossphilippines.com"  => { d => "host1.bluecrossphilippines.com", a => 'rsa-sha256', ttl => 10*24*3600 },
    #"host2.bluecrossphilippines.com"  => { d => "host2.bluecrossphilippines.com", a => 'rsa-sha256', ttl => 10*24*3600 },
    # ---- End domain: bluecrossphilippines.com ----

    # catchall defaults
    '.' => { a => 'rsa-sha256', c => 'relaxed/simple', ttl => 30*24*3600 },
} );

thanks..for the support