4.7 smtpd "500 Pipelining unsupported"

I have a fairly generic configuration for smtpd accepting mail on an IPv6 interface. In the following email attempts, I'm seeing a 500 error from smtpd. The entry in /var/log/maillog is: Sep 24 16:04:35 mail smtpd[9272]: 1285362275.rTy5IAatxEJ1PUGX: from=, relay=blog.example.net [IPv6:2001:x:y::25

Re: 4.7 smtpd "500 Pipelining unsupported"

On Fri, Sep 24, 2010 at 17:06, Darrin Chandler wrote: > As indicated, pipelining isn't (yet) supported. See > http://tools.ietf.org/html/rfc2920, specifically: [..] > Ideally the sender would obey this, but many assume pipelining support > is present and do not check. Ah, I see. Thanks much.