we have four incoming sendmail devices (firewalls) two are public facing while two are in a dmz. strange problem, emails that go through the public facing sendmail, get sent to exchange in html format (no problem) when these same emails are sent through dmz sendmail, they get sent to exchange...
i dont think i said the ping was tcp. but ping is considered interesting traffic in keeping and keep create and maintain a connection, socket, or vpn tunnel...
good luck
can you write this 'software' to be web based so that anyone in the world can access this. then you would not have the issues of people not having acces. if you have the website have an ssl connection (secure socket layer).
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