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 and RBL Checklists.
2Large Networks uses the following methods to determine whether a sending server can be identified as a spam source:
1. Reverse DNS check
Every server on the internet should have a reverse DNS entry, especially mail servers.
Our mail server checks for reverse DNS entries. Any email coming from a server without one is blocked. This stops a lot of email from servers that shouldn't be sending email, such as virus-infected home computers on ADSL connections.
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. Check for no mail exchanger, making the sender address invalid.
Please contact us to resolve this issue for you as quick as possible.
|syslog code||SMTP message|
|DENIED_ACCESS_DENIED||Refused. Access is denied.|
|DENIED_AUTH_REQUIRED||Refused. Authentication is required to send mail.|
|DENIED_BLACKLIST_IP||Refused. Your IP address is blacklisted.|
|DENIED_BLACKLIST_NAME||Refused. Your domain name is blacklisted.|
|DENIED_EARLYTALKER||Refused. You are not following the SMTP protocol.|
|DENIED_OTHER||The text returned by qmail (or the downstream filter that generated the rejection).
You rmail has been blocked by a Spamassassin filter.
|DENIED_RDNS_MISSING||Refused. You have no reverse DNS entry.|
|DENIED_RDNS_RESOLVE||Refused. Your reverse DNS entry does not resolve.|
|DENIED_RHSBL_MATCH||The text returned by the RHSBL (if any) or
Refused. Your domain name is listed in the RHSBL at name.
|DENIED_RECIPIENT_BLACKLISTED||Refused. Mail is not being accepted at this address.|
|DENIED_SENDER_BLACKLISTED||Refused. Your sender address has been blacklisted.|
|DENIED_SENDER_NO_MX||Refused. The domain of your sender address has no mail exchanger (MX).|
|DENIED_TOO_MANY_RECIPIENTS||Too many recipients. Try the remaining addresses again later.
Max recipients is set to 50
|DENIED_UNQUALIFIED_RECIPIENT||Improper recipient address. Try supplying a domain name.|
|DENIED_ZERO_RECIPIENTS||Refused. You must specify at least one valid recipient.|
|TIMEOUT||Timeout. Talk faster next time - your SMTP connection is too slow.|
|UNKNOWN_AUTH||Refused. Unknown authentication method.|