My company runs their own Exchange server inhouse and we also utilize Postini for our email filtering. We host our external dns with an outside vendor, easydns. We recently launched a new website which is being hosted at an offsite location. When users go to this site they are able to fill out online forms and then click a submit button to have them sent to internal email accounts within my organization. I have created 4 different groups in AD, then i added the users to those groups who should receive the messages from the online forms. Then i sent a few emails from outside with my personal account to these groups and each user received the test.
When this outside webhost clicks on the submit button of these forms, it generates a message to be sent to the same group email address as i tested. However, the difference here is that they are sent with the To and From addresses both containing valid email addresses from within my organization. The thought here is that they will need an SPF record added to their DNS to allow the webhost's email server send to my email server while using a To and From address on the email that matches to a valid email address in my company.
I have created one SPF record, actually a TXT record as easy DNS will not allow you to create an SPF record they make you create a TXT record as the SPF record. I added the info provided to me from my webhost, but there is nothing in there for Postini as i'm not sure if it's needed or what it should be.
Does anyone have any suggestions?