IBM AIX 5.2 and earlier distributes Sendmail with a configuration file (sendmail.cf) with the (1) promiscuous_relay, (2) accept_unresolvable_domains, and (3) accept_unqualified_senders features enabled, which allows Sendmail to be used as an open mail relay for sending spam e-mail.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Aix | Ibm | * | 5.2 (including) |