Recently renewed my subscription for Adobe Export PDF and trouble shooting with a representative from Adobe, still getting an error message (Unable to Send Message) when trying to email a pdf document. Went through the process of signing in and out and checking the firewall and still the error message comes up saying "Your message was unable to be sent. Please check your network connectivity and try to send again. (Error: 5.20 rTnT1y0035NN3FG01TnTBA Message identified as SPAM - Please visit http://charter.com/postmaster E5110)
Since its an network error, then you may turn the internet security software off for a while and check back.
[Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install or activate other software, you should re-enable it as soon as you're done.]