NEW: Spamdyke is a spam protection program that filters incoming messages at the SMTP level by blocking connections from mail servers identified as spam sources or that match certain reverse DNS validation rules.

The Spamdyke program is enabled by default. You can enable or disable Spamdyke and configure its options from your online Control Panel's Mail Manager section, under "Edit global mail settings". Spamdyke can be configured only globally for the hosting account, it cannot be managed per mailbox.

Spamdyke uses several methods to determine whether a sending server can be identified as a spam source:

1. Reverse DNS check
If there is no valid reverse DNS name of the sending mail server, the message is blocked.

2. RBL Checks (Lists of known spam hosts).
Spamdyke checks the sending server IP address against several databases of known spam hosts. In case the sending server IP is listed in any of them, the message is blocked.

3. Graylisting/Greylisting (optional)
Spamdyke can also be configured to use Graylisting. Graylisting is the technique of denying mail delivery the first time a sender tries to deliver to a recipient. The next time the remote server attempts to deliver the message, it is accepted. All future messages from the sender to the recipient are also allowed. With Graylisting enabled, our mail server will "temporarily reject" any email from a sender it does not recognize. The originating server will try a new delivery, usually in a few minutes, and if the mail is legitimate, it will be accepted. If the mail is from a spammer it will probably not be retried, as spammers go through thousands of email addresses and cannot afford the time delay to retry a particular message. Standard mail servers, however, always attempt to deliver messages again if they are rejected with such a “temporary” error message, in accordance with the SMTP RFC specifications.

Note: Filtered Messages and Junk folder
Please note that messages filtered by the Spamdyke program are blocked at the SMTP level. Therefore, in case you have Spamdyke enabled, the messages blocked by it will not be delivered to your Junk Mail folder.

Note: Filtered Messages and White lists (Spam Assassin)
Please note that the white/black lists do not affect the Spamdyke program. In other words, if you have a certain sender email address whitelisted, messages coming from this sender will still be processed by the Spamdyke program and might be blocked.