SPF lets them specify, by domain name, where emails originate. As long as they configure that properly, they should be fine. The IBM server would either have a public IP address or NAT to a public IP address or relay all the messages through another server. Wherever that public IP ends up needs to be listed, in some fashion, in the SPF record.
From: Rich Loeber
Sent: Friday, September 21, 2012 10:04
To: Midrange Systems Technical Discussion
Subject: IBM i - SPF - An Mail Relay
I have a customer who wants to implement SPF for their domain. Their IBM
i issues email messages, which I understand are relayed through the SMTP
server on the i. In researching SPF, it appears like it may not like
Is there a chance that implementing SPF will stop the email messages being
sent from their i?
Rich Loeber - @richloeber
Kisco Information Systems
This email is confidential, intended only for the named recipient(s) above and may contain information that is privileged. If you have received this message in error or are not the named recipient(s), please notify the sender immediately and delete this email message from your computer as any and all unauthorized distribution or use of this message is strictly prohibited. Thank you.