In order to ensure on time delivery and limit the network’s exposure to items with a negative impact on the network reputation, we’ve started enforcing an additional layer of security. You may have come across a message rejection that looks like this.
“Rejected. Please contact your service provider: Your message contained a SPAM URL and was blocked by ExchangeDefender.”
ExchangeDefender scans all outbound messages for possible SPAM patterns. This particular message contained a SPAMvertised URL which is typically a compromised web site or URL used in thousands of confirmed SPAM messages by a third party authority (Realtime Blacklist). In order to keep you from blacklists and RBL systems, we automatically block messages with SPAM web addresses and return to the sender. This way your legitimate messages do not end up delayed or in junk folders with other service providers.
ExchangeDefender outbound relays cannot deliver outbound mail with the SPAMvertised URL(s) in it until it is removed from the blacklists. In order to protect your server ExchangeDefender will automatically block these messages. You can choose not to use ExchangeDefender outbound servers but if you do so your mail server will likely end up on an RBL and then you will not be able to relay through ExchangeDefender even after you remove your server from the URIBL lists.
If you run into these rejections please give my staff the from, to, and relay IP and they will be able to help you find out the content triggering the rejection.
VP Support Services, ExchangeDefender
(877) 546-0316 x737