Form enquiries are being held in Plesk deferred mail

Hi

I’ve used CF7 lots of times, but this is the first one on a plesk server. The enquiry emails are going into a deferred area in plesk so don’t come through. I’ve setup the email sender with an actual address from the server. I normally do this and it works on other servers, but this plesk issue has got me stumped.

Any ideas are welcome.

Regards
Wayne