MailChimp can’t process UTF-8 characters in email address prefixes

Re:MailChimp can’t process UTF-8 characters in email address... by tyingq on Sunday July 23, 2017 @10:28AM (#14832393)

It's not just Exchange. RFC6530 support is pretty spotty.

Fastmail, which is pretty popular here, only allows a-z0-9_ in usernames. I don't see a "250 SMTPUTF8" reply when I connect to their server and EHLO. So, it's likely they don't support it either.

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Re:MailChimp can’t process UTF-8 characters in email address... by yladiz on Sunday July 23, 2017 @12:12PM (#14832953)

I use Fastmail and have sent myself a testing email with non-ASCII emails, like with Korean or Chinese characters. So 안녕@mydomain works with Fastmail.

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Re:MailChimp can’t process UTF-8 characters in email address... by tyingq on Sunday July 23, 2017 @12:19PM (#14832982)

So apparently if you host your own domain with them they do?

However, they don't appear to support it for [email protected]. Either for sign up, or for live delivery. http://imgur.com/a/Otf4f (see both images)

Try sending to 안녕@mydomain from a gmail account...it looks like they may not be supporting SMTPUTF8 correctly. Which could result in sending-to-yourself working, but not from an outside source.

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