[Feature] UTF8 encoding for email addresses (SMTPUTF8 extension)

[lennieh]

I'm using this in my dev environment, but now have German & Swedish clients with non-ASCII characters in their email addresses.

I think I know how to fix it (Encode the addresses to UTF8), but I can't test with smtp4dev because it rejects non-ASCII characters in the email address...

Can you confirm, the smtp4dev doesn't support encoding the email address, so at least I know it's no my code's fault :-)

And obviously it would be good include support for encoding if you don't support it currently.

[apair]

It does not support UTF-8.
You can use other smtp app like fakesmtp (based on JVM)

[rnwood]

Yes this is correct. Non ASCII chars in email address are not supported. We do already support non ASCII chars in the message.

To achieve this we need to implement the SMTPUTF8 extension.

[rnwood]

Just a note to say that there is progress on this. The latest builds of rnwood.SmtpServer component now have experimental support for the SMTPUTF8 extension and I'm doing some testing with various old and new clients to confirm the my interpretation of the spec and reality of real-world clients are aligned when running in smtp4dev.

Once thing I have found that is tricky to deal with is that older clients that don't support SMTPUTF8 sometimes "just send 8 bit" to send non ASCII encoded data (and non UTF-8) even in the RCPT TO and MAIL FROM arguments.

[rnwood]

I believe that this feature is now complete. Comments and bug reports welcome!