Why an IP / Domain might have a poor reputation / spam related issue

• There have been reports of spam from your IP. Look up your IP's reputation on SenderBase.
• Your IP exhibits DNS patterns that indicate compromise by a SpamBot. Make sure your DNS is configured according to the protocol for RFC2821, section 4.1.1.1 (http://www.imc.org/ietf-smtp/mail-archive/msg00827.html)
• Your IP contained links to domains hosting or distributing malware
• Checking your ip/domain: http://multirbl.valli.org/dnsbl-lookup/
• https://ipcheck.proofpoint.com/

One way to avoid having your email inadvertently blocked is by registering your domain and IP addresses at EmailReg.org. Emails from domain names and IP addresses that are properly registered on EmailReg.org can be automatically exempted from spam filtering defense layers on Barracuda Spam Firewalls and other anti-spam solutions, preventing your email from being accidentally blocked.