Email sending servers for multisite subsites

Hi Folks
I've read a few other posts and this documentation https://premium.wpmudev.org/docs/hosting/emails/ and still have a query re. sending email notifications from login / contact forms etc on a multi-site network.
I'm planning to set up a zoho account to manage my emails for the network and I'm thinking that I should use the same account for email notifications from subsite contact forms such as forminator.
If I set the network to use my zoho (or another similar service) account for sending notifications, is is best to set up a 'noreply' email with an autoresponder, as I think, even if I set say a contact form to send from the subsite's email address, the email set in Branda (or other plugin) will show as the sending email as my email rather than that of the subsite? Sorry, there is a question in there somewhere :slight_smile:
Many thanks
Richard.