SMTPUTF8 supports non-ASCII characters in email addresses. Learn what it is and what compatibility looks like.
SMTPUTF8 is an SMTP extension that enables UTF-8 characters in email addresses and headers. It supports internationalized email use cases.
Compatibility depends on both sending and receiving infrastructure. When unsupported, systems may reject or transform addresses, so testing is important if you rely on non-ASCII local parts.
Related Keywords
smtputf8internationalized emailutf8 email addressemail idnsmtp extensions