I have encountered an interesting behavior with a couple of R6.01 CF1 servers. To prevent the servers from being used as a SPAM relay, I have set the SMTPAllowRelayDomains field in the Inbound SMTP Relay Control section of the Configuration Doc to the specific domain of the company (ie: company.com).
In general, this is working great but I have discovered a behavior that I haven’t found a switch to disable.
If the SMTPAllowRelayDomains field is set to company.com, it will happily accept mail for company.com but it will also accept mail for companyinc.com, company1.com, or anything else that starts with ‘company’+ ?.com
Has anyone else seen this and is there an ini parameter to set to force it to only accept the actual text in the field? The servers were both fresh, new server installs without any previous server notes.ini information. I believe this is a new R6 behavior as I have a number of clients running R5 that do not have this behavior on their R5 SMTP Inbound servers.
Thanks,
Erik Ostly
Ostly Consulting Group