Outgoing messages won't send. Eror message 550 says it is suspected they are Spam. They are not.
As stated in the Spam FAQ page, try sending the message to firstname.lastname@example.org for review. You attach the message that you are unable to send, and they review it. Depending on the outcome of the investigation, the filter will either be updated to allow the content that was previously blocked, or it will be determined to be a legitimate block and no changes will be made.
Some troubleshooting steps you can try:
If you have a signature, try removing one line at a time from it and attempting to send the message again. Some signatures look like "ads" to the filters, apparently.
If you are using a pop3 client (Outlook, Outlook Express, etc.) try sending your message from the verizon.net website. If this resolves the issue, then it is something that your client is adding to the message that is causing it to be blocked.
If the Subject line of your message has a whole bunch of "Fwd: Fwd: Re: Fwd:" try removing some of them.
Remove any links/URLs from the email one at a time to isolate if one of them is causing the block.
Some people have suggested sending the message to email@example.com for investigation. This may work for you as well.
Here's a problem for you:
How do you send a spam email about a third party service like PayPal that has a spoof address where you forward such spam emails without it getting trapped by the Verizon outgoing spam catcher?
This is a Catch-22 in that you can't report the suspicious email to the proper provider because it is correctly identified by the ISP who is trying to stop spam... and yet this is a legitimate forwarding of a spam email to a third party that has an active email address for you to send them to... yet you can't get the email to them because of the ISP blocking it!
Any help is appreciated.