filter smtp port juniper M20

["Jess" <z () divemedic net>]

Hey all,

New to list but I hope I'm in the right place....

so I setup a filter on a Juniper M20 because I have an old folks home sending spam and they can't seem to figure out 
how to clean up their computers. Now port 25 has been blocked both in and out since June 7 but I'm still receiving 
complaints timestamped after the period I put on the filter. Is there any way spam can be sent via alternate routes or 
did I set up my filter wrong?

jxxxxx () core1 xxx> show configuration interfaces at-0/0/0.0 
description "Senior Commmunity ";
encapsulation atm-snap;
vci 00.00;
shaping {
    vbr peak 1368000 sustained 1368000 burst 3;
    queue-length 10;
}
family inet {
    filter {
        input abuse_smtp_block;
        output abuse_smtp_block;
    }
    address 66.243.190.77/30;
}

**********************************

term 10 {
    from {
        source-address {
            66.243.190.214/32;
        }
        source-port smtp;
    }
    then {
        count counter;
        log;
        discard;
    }
}
term 20 {
    then accept;
}

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