How do I know I received a legitimate email from AIA Contract Documents?

AIA Contract Documents uses the following domains when contacting you: 

• Communications regarding AIA Contract Documents' Online Platform, purchasing, and educational resources will come from [e-mail]. 
• Communications sent from AIA Contract Documents' Sales, Technical and Document Support will come from [e-mail].
• Communications sent from AIA Contract Documents' employees will come from [e-mail].