[Dovecot] Dovecot 2.0+LMTP: Legal MAIL FROM rejected?

Hi,

I run Dovecot 2.0.13 fed by Postfix over LMTP. Today it rejected one mail Postfix and Amavis accepted, generating a bounce. It was just a spammail, but I think the sender address is legal according to RFC5321 and should be accepted. I don't like generating bounces, email should be either rejected by postfix/pre-queue-amavis or delivered.

Jun 6 12:32:47 mail postfix/qmgr[840]: 991FC240DB: from=admin@kl38000.com, size=8427, nrcpt=1 (queue active) Jun 6 12:32:47 mail amavis[27046]: (27046-06) FWD via SMTP: <"admin -> user@domain.com,BODY=7BIT 250 2.0.0 Ok, id=27046-06, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 991FC240DB Jun 6 12:32:47 mail postfix/lmtp[4710]: 991FC240DB: to=user@vmail.domain.com, orig_to=user@domain.com, relay=pop3.domain.com[::1]:24, delay=0.24, delays=0.09/0.11/0.03/0.01, dsn=5.5.4, status=bounced (host pop3.domain.com[::1] said: 501 5.5.4 Invalid parameters (in reply to MAIL FROM command))

It looks like dovecot/lmtp does not accept an address with quoted localpart that contains a space

mail from:<"admin admin"@kl38000.com> 501 5.5.4 Invalid parameters mail from:<"adminadmin"@kl38000.com> 250 2.1.0 OK mail from:<"admin 250 2.1.0 OK

Bernhard