In the beginning, everything was ASCII and English. Since then, we’ve seen Unicode (international character sets) and IDN (international domains names) become widely adopted. Last year we implemented SMTPUTF8 that enables international mailboxes.

So why not support other languages in text-based protocols? We give to you “The SMTP Service Extension for Protocol Internationalization” RFC draft, introducing the EHLO keyword LANG. It will be the first SMTP software to support our to-be submitted RFC draft. Initially it will support Swedish, Spanish and Australian, and will default to Swedish when talking to supported systems.

EHLO example.com
250-LANG SE ES AU
LANG SE
250 Ok
BREV FRÅN:<>
250 Tack
BREV TILL:<håkan@domän.se>
250 Tack
INNEHÅLL
Subject: asdf

Hej!
.
250 Togs emot
HEJDÅ
250 Vi ses!

If you made it this far, April fool! We will publish information on the upcoming 4.6 release some time after the 1st of April.

Happy easter!