| syslog code | SMTP message | Option to change message |
| DENIED_ACCESS_DENIED | Refused. Access is denied. | rejection-text-access-denied |
| DENIED_AUTH_REQUIRED | Refused. Authentication is required to send mail. | rejection-text-smtp-auth-required |
| DENIED_BLACKLIST_IP | Refused. Your IP address is blacklisted. | rejection-text-ip-blacklist |
| DENIED_BLACKLIST_NAME | Refused. Your domain name is blacklisted. | rejection-text-rdns-blacklist |
| DENIED_EARLYTALKER | Refused. You are not following the SMTP protocol. | rejection-text-earlytalker |
| DENIED_GRAYLISTED | Your address has been graylisted. Try again later. | rejection-text-graylist |
| DENIED_IDENTICAL_SENDER_RECIPIENT | Refused. Identical sender and recipient addresses are not allowed. | rejection-text-identical-sender-recipient |
| DENIED_IP_IN_CC_RDNS | Refused. Your reverse DNS entry contains your IP address and a country code. | rejection-text-ip-in-cc-rdns |
| DENIED_IP_IN_RDNS | Refused. Your reverse DNS entry contains your IP address and a banned keyword. | rejection-text-ip-in-rdns-keyword-blacklist |
| DENIED_OTHER | The text returned by qmail (or the downstream filter that generated the rejection). | |
| DENIED_RBL_MATCH | The text returned by the DNS RBL (if any) or
Refused. Your IP address is listed in the RBL at name. | rejection-text-dns-blacklist |
| DENIED_RDNS_MISSING | Refused. You have no reverse DNS entry. | rejection-text-empty-rdns |
| DENIED_RDNS_RESOLVE | Refused. Your reverse DNS entry does not resolve. | rejection-text-unresolvable-rdns |
| DENIED_RHSBL_MATCH | The text returned by the RHSBL (if any) or
Refused. Your domain name is listed in the RHSBL at name. | rejection-text-rhs-blacklist |
| DENIED_RECIPIENT_BLACKLISTED | Refused. Mail is not being accepted at this address. | rejection-text-recipient-blacklist |
| DENIED_REJECT_ALL | Refused. Mail is not being accepted. | rejection-text-reject-all |
| DENIED_RELAYING | Refused. Sending to remote addresses (relaying) is not allowed. | rejection-text-relaying-denied |
| DENIED_SENDER_BLACKLISTED | Refused. Your sender address has been blacklisted. | rejection-text-sender-blacklist |
| DENIED_SENDER_NO_MX | Refused. The domain of your sender address has no mail exchanger (MX). | rejection-text-missing-sender-mx |
| DENIED_TOO_MANY_RECIPIENTS | Too many recipients. Try the remaining addresses again later. | rejection-text-max-recipients |
| DENIED_UNQUALIFIED_RECIPIENT | Improper recipient address. Try supplying a domain name. | rejection-text-local-recipient |
| DENIED_ZERO_RECIPIENTS | Refused. You must specify at least one valid recipient. | rejection-text-zero-recipients |
| FAILURE_AUTH | Refused. Authentication failed. | rejection-text-auth-failure |
| FAILURE_TLS | Failed to negotiate TLS connection. | rejection-text-tls-failure |
| TIMEOUT | Timeout. Talk faster next time. | rejection-text-timeout |
| UNKNOWN_AUTH | Refused. Unknown authentication method. | rejection-text-auth-unknown |
