What considerations should PHP developers keep in mind when sending emails to domains with special characters, like umlauts?

When sending emails to domains with special characters like umlauts, PHP developers should ensure that the email addresses are properly encoded using Punycode to convert special characters into ASCII characters. This ensures that the email is delivered correctly to the recipient's mailbox. 

$email = 'user@example.com'; // Email address with special characters
$encoded_email = idn_to_ascii($email); // Encode email address using Punycode

// Send email using the encoded email address
mail($encoded_email, 'Subject', 'Message');

Keywords

PHP email special characters umlauts encoding

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