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<p>OTH, my guess is that Cyrus is failing to create the tmpfile to
stage the message. Is /tmp (or its equivalent) full, or not
writeable?</p>
<p>Without something from the Cyrus syslog, this will be hard to
diagnose.<br>
</p>
<br>
<div class="moz-cite-prefix">On 06/01/2018 12:51 PM, Stephen Ingram
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPsaoBfe0o=dVWtfSMpLCtisu+sLOv=h_6OyMJZXuRqUzKk2rw@mail.gmail.com">
<div dir="ltr">Ken-
<div><br>
</div>
<div>That all appears to be working correctly. Here's a cut from
the Postfix debug with addresses obfuscated:</div>
<div><br>
</div>
<div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr offset
= 682</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr
dsn_orig_rcpt = <a href="mailto:rfc822%3Bx@x.com"
moz-do-not-send="true">rfc822;x@x.com</a></div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr
notify_flags = 0</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr status
= 4.3.0</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr
diag_type = smtp</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr
diag_text = 451 4.3.0 System I/O error</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr
mta_type = dns</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr
mta_mname = imap.x.x</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr action
= delayed</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: send attr reason
= host imap.x.x[10.0.13.83] said: 451 4.3.0 System I/O error
(in reply to end of DATA command)</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: private/defer
socket: wanted attribute: status</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: input attribute
name: status</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: input attribute
value: 0</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: private/defer
socket: wanted attribute: (list terminator)</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: input attribute
name: (end)</div>
<div>Jun 1 16:48:52 mx postfix/lmtp[18136]: B7B0B9A2EB0:
to=<a class="moz-txt-link-rfc2396E" href="mailto:x@x.x"><x@x.x></a>, orig_to=<a class="moz-txt-link-rfc2396E" href="mailto:x@x.x"><x@x.x></a>,
relay=imap.x.x[10.0.13.83]:24, delay=0.3,
delays=0.19/0/0.09/0.02, dsn=4.3.0, status=deferred (host
imap.x.x[10.0.13.83] said: 451 4.3.0 System I/O error (in
reply to end of DATA command))</div>
</div>
<div><br>
</div>
<div>Steve</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Jun 1, 2018 at 9:33 AM, Ken
Murchison <span dir="ltr"><<a
href="mailto:murch@fastmail.com" target="_blank"
moz-do-not-send="true">murch@fastmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><span
class="">On 6/1/18 12:21 PM, Stephen Ingram wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
I'm receiving a 451 4.3.0 System I/O error (in reply to
end of DATA command) error from Postfix when trying to
deliver to cyrus-imap and not really sure why. I'm on
CentOS 7 (2.4.17-8) after downgrading from current
version. I'm using Kerberos GSSAPI to connect to the
front end, but authentication appears to be working fine
as I can see authenticated when enabling LMTP debugging
in Postifx. All messages are refused for delivery
though. I'm not sure what to do. Any suggestions?<br>
</blockquote>
<br>
</span>
Any chance that Kerberos is negotiating a security layer?<span
class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
Kenneth Murchison<br>
Cyrus Development Team<br>
FastMail Pty Ltd</font></span>
<div class="HOEnZb">
<div class="h5"><br>
<br>
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</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Ken Murchison
Cyrus Development Team
FastMail US LLC</pre>
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