SMTP IDN # Server-side # Client-side smtp IDN !win32 codeset-utf8 LC_ALL=C.UTF-8 SMTP without SMTPUTF8 support (IDN) - UTF-8 recipient (host part only) From: different To: another body smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt recipient@%hex[%c3%a5%c3%a4%c3%b6]hex%.se --mail-from sender@example.com -T - # Verify data after the test has been "shot" EHLO %TESTNUMBER MAIL FROM:%LTsender@example.com%GT RCPT TO:%LTrecipient@xn--4cab6c.se%GT DATA QUIT From: different To: another body .