I can see the email hitting the server and going out to the guest as you are using military email addresses you will need to contact your IT folks to find out what they are doing with the emails. if you give them this log extract they can see what happened
example
Oct 10 18:11:17 toastmastersclubs sendmail[4293]: s9AIBGAJ004290: to=<tamara.xxxxxxxxx@ang.af.mil>, ctladdr= (501/502), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=131131, relay=ext-ang1.ang.af.mil. [132.3.45.19], dsn=2.0.0, stat=Sent (+OK message queued for delivery.)
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