Hello,
I'm setting up Dovecot 2.3.2.1 as a submission proxy to a Postfix backend server. Dovecot announces CHUNKING, but the Postfix backend does not support (or announce) it.
HELO from Postfix:
220 backend.mydomain.com ESMTP Postfix (Ubuntu) ehlo test 250-backend.mydomain.com 250-PIPELINING 250-SIZE 104857600 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN
HELO from Dovecot proxy:
220 proxy.mydomain.com Dovecot ready. ehlo test 250-proxy.mydomain.com 250-8BITMIME 250-AUTH PLAIN LOGIN 250-BURL imap 250-CHUNKING 250-ENHANCEDSTATUSCODES 250-SIZE 250-STARTTLS 250 PIPELINING
When a client sends BDAT, Postfix closes the connection. Here's a log snippet from Postfix:
< MAIL FROM:user@mydomain.com
250 2.1.0 Ok < RCPT TO:some@recipient.com 250 2.1.5 Ok < BDAT 114098 LAST 502 5.5.2 Error: command not recognized < Content-Type: multipart/alternative; boundary=Apple-Mail-55D35F74-2EB7-4B3B-A607-E421DD71C07A 221 2.7.0 Error: I can break rules, too. Goodbye.
Apple Mail seems to ignore the fact that Postfix does not understand BDAT and Postfix does not like that :-)
From a quick glance at the code it seems CHUNKING is always added to the capabilities and that's not configurable. Is this a bug or am I doing something wrong?
Thanks,
Michael