Email Not sending 500 error

Issue with Sitegrounds Shared Hosting I think. Not sure.
any help?
I am hosting on Sitegrounds Shared, and receive this error when attempting to send error report Home. Emails are not sending.

500: Email “” does not comply with addr-spec of RFC 2822.

Is this issue with host or setup?


@david can you please advise?

It looks like the system is trying to send an email to which isn’t a valid email address? perhaps this line has been placed in an incorrect spot in your configuration?

Right! So This is from Sitegrounds:
Incoming Server:
IMAP Port: 993 / POP3 Port: 995
Outgoing Server:
SMTP Port: 465

And this is in the .env file:

I have tried multiple entries here but so for no joy!

Also, just received this error occurs when trying to send an invoice: XMLHttpRequest error.