Formmail not sending to some addresses

i have a formmail set up on one of the sites on my account. the recipient of the form is an alias that forwards to myself (a dreamhost mailbox) and to two other alias address, both of which forward to addresses outside of dreamhost. my dreamhost mailbox has received every email from the form BUT the other two addresses outside of dreamhost never get the email. i have tested the two aliases with regular email and the email was successfully forwarded to the recipients but when these aliases are used on the form nothing is being sent to them.

i have this formmail set up on other dreamhost sites that send email to address outside of dreamhost and they all work fine. anyone know why the 2 email aliases aren’t working with the formmail? is dreamhost blocking something?