Is the message "Delivery not allowed to non-local"? - or similar
If so try ticking the "My server requires Authorisation" box in the settings.
Otherwise - yes the complete message would save us having to guess what it is - please.
Surface Pro 5 News - release date, UK price, features, specs
Microsoft Surface Studio hands-on review: the iMac killer is here
Best Mac antivirus 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.