Reply To: Emails being sent to spam

Thanks for the lead. I’ve investigated further and emails that are sent to guests appear to be fine as long as I use an SMTP plugin to force emails through the right server. It’s the emails that are “send to admin” that end up in spam..
Is there an easy way to force all emails sent to admin to originate from the admin email address? Currently they’re sent using the address the guest enters in the From: field, but this triggers SPF fails. They should be sent From: “admin email” and Reply-To: “guest email”.

This isn’t a huge issue, but if unresolveable we will need to fish bookings out of the spam folder every day as 100% of them will fail to pass SPF checks.
Thanks for your assistance!