Diagnostic-Code: smtp; 552 5.2.2 user is overquota
Why should I get this when sending a simple (text, no attachment) email to an icloud address?
Chris
User profile for user:
i_rina
User level:
Community Specialist
Hello and welcome to Apple Support Communities, Chris!
I understand you're seeing an error when trying to send an email to an iCloud email address. I'd be happy to help you troubleshoot.
Give the steps in the following article a try: Get help using iCloud Mail
If you're still having this issue after troubleshooting, does it also happen if you try sending to other iCloud addresses? If it only happens with this specific email, the issue may be on their end.
Have a great day!