>Forgive me, but I'm not quite sure I understand. All of the domains have MX >records - does this happen because the domains are set up as virtual domains >on the mail server?
The point is you have another machine (mail server, web server, etc.) sending mail directly to the destination servers, or through an SMTP server not listed in your MX records. List those in your SPF as well and you'll be fine. In general, if you specify fail for all servers other than those specified, then make sure ALL servers that send mail are listed in SPF >I'm not sure that is possible. The offices are not our satellite offices; >we just host email for them. How would this work for people who travel with >laptops, etc.? Doesn't matter... just follow the above guidelines and make sure the SMTP servers they use are listed in your SPF, either by MX or direct IP. >I just got to thinking of something. Our IMail server is set up as >mail.ourdomain.com. All of the people who we host mail for have their >outgoing mail set up to use mail.ourdomain.com instead of >mail.theirdomain.com. Would this cause any of the issues that we are >seeing, now that we are getting things tightened up? Is mail.ourdomain.com listed in the SPF for their domain (either by the MX directive or by IP), or is mail.theirdomain.com listed? If mail.theirdomain.com is their MX record, then add the IP for mail.ourdomain.com to their SPF record, again, along with all servers that send mail for their domain. Note that this means _every_ SMTP server used by the domain has to be identifed in the SPF record or the mail from unidentified SMTP servers will fail SPF. Darin. To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
