How do I resolve 'internal error' when sending emails from iCloud to various domains?

Based on the information provided here is an analysis:

MTA: dns me . com → The mail transfer agent (MTA) encountered an issue when trying to resolve a domain.

Status: 5.7.0 → This SMTP error typically means a policy-related rejection (e.g., authentication failures, spam filtering, or security settings).

Diagnostic-Code: X-Postfix; internal error → A generic internal failure in Postfix, likely due to DNS, policy, or configuration issues.

I would ignore the last issue as you don't have any control over this.

There are few things you need to check:

1. Your computers internet connection is operating as expected.
2. Check your computers disk space
3. Check the addresses you entered are correct. Check that you enter multiple address correctly. I see a "|rfc822" in the Original-Recipient list which looks wrong. I'm suspecting a typo in at least one of those addresses.
4. try sending to one address at a time and see if any of them bounce back.

Good luck

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