How can Postfix errors be resolved when sending emails with IDN-encoded domains?

When sending emails with IDN-encoded domains using Postfix, errors may occur due to encoding issues. To resolve this, you can configure Postfix to use UTF-8 encoding for IDN domains by setting the "smtp_dns_support_level" parameter to "dnssec". This will ensure that the email addresses are properly encoded and can be delivered successfully.

// Configure Postfix to use UTF-8 encoding for IDN domains
$smtp_dns_support_level = "dnssec";