CHUNKING support

Hi,

I’m currently working with aiosmtpd and wanted to ask whether CHUNKING (i.e. the BDAT SMTP command as defined in RFC 3030) is currently supported.

If it’s not supported at the moment, is there any plan to add support for it in future versions?

CHUNKING support would be very helpful for handling large messages or for compatibility with mail servers like Microsoft Exchange that may use BDAT when sending emails.

Thanks for your work on this great project, and looking forward to your thoughts.