Email header: change to return-path

Email header: change to return-path

HI,

About 24 hours ago there was a change in the email headers going from my Creator application.  The field "return-path"  is no longer using the administrator email address.  Instead it is using <mailserver+(myname)@zohocreator.com>.  This has created problems for me with downstream service providers and has prevented these emails from being delivered.

How & why did this change occur?  Can it be changed back, and if not, why not?

Please can you help?

Many thanks

Anna