System Admin Pro Email Office 365 "asterisk@" problem

When entering an Office 365 email account into the email setup, FreePBX/Postfix insists on sending emails to Office 365 as "asterisk@", therefore sent emails get rejected, unless the Office 365 user account is also "asterisk@".

I have tried adding a postfix rewrite but it still insists on sending to "asterisk@".

As this is a commericial module it should obviously just work out of the box without having to mess about with config files (even if it worked).

Many thanks!