[Dovecot] lmtp bouncing -- Invalid parameters (in reply to MAIL FROM command)

Jan-Frode Myklebust janfrode at tanso.net
Wed Aug 31 14:21:31 EEST 2011

On Wed, Aug 31, 2011 at 01:03:07PM +0200, Jan-Frode Myklebust wrote:
> I just configured postfix' virtual_transport to point at my dovecot
> director, but am seeing occational problems like this:
> 	Aug 31 11:50:06 smtpgw postfix/lmtp[5339]: 69E2F5410D: to=<email at example.net>, relay=loadbalancers.example.net[]:24, delay=0.15, delays=0.14/0.01/0/0, dsn=5.5.4, status=bounced (host loadbalancers.example.net[] said: 501 5.5.4 Invalid parameters (in reply to MAIL FROM command))

Further digging shows that these messages are from an address containing
quotes and spaces:

	mail from:<"a b"@no.no>
	501 5.5.4 Invalid parameters

Testing with postfix + dovecot lda (v1.2.16) the messages gets
trough just fine. Is this auth_username_chars kicking in, or some
other check of valid characters in lmtp from ?


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