How do I change the email reply-to field?

Within the Account Admin section, go to the Customize Emails page. In" Step 1: Choose Who Email Will Be From" you can select from the Sub-Account's Client Administrators.

TIP: The $$replyto$$ tag  in the body of your email displays the name you have selected above.

NOTE: It is not possible to change the from field for an email as this would create spam warnings and security problems, but the email will appear to come from the Client Administrator you have set.