We have to have someplace to put your filtered messages after downloading them from the external accounts we filter for you. We cannot put them back into the address that we downloaded them from because this would cause us to download and filter the same emails repetitively. Your "@OnlyMyEmail.com" address is where put your filtered email.
Consequently, having an @OnlyMyEmail address does not mean that you must use this in your outgoing messages or provide the address to anyone else (though you certainly may).
What is required is that you download your messages from your @OnlyMyEmail.com account because that's where we put your emails after we've filtered them.
There is one exception of which you should be aware. If you choose to send emails from our Webmail interface, these messages will be sent "From" your UserName@OnlyMyEmail.com address and this cannot be changed.
Notice: This does not apply to Corporate MX-Defender clients as that system filters email before it reaches your email server.
