Hi all,
I have a problem around error 456. I run courier 0.53 on Debian Linux. On
one machine mail is often rejected with "456 Address temporarily
unavailable". After checking the configuration again and again, I suspect
it's rather due to the behavior I found described in an earlier post
(2007-06-26):
>> Correct. A 456 error gets reported only after an earlier delivery
>> attempt to the recipient fails.
>> Then, Courier will reject all further
>> deliveries to the same recipient with either a 456 or a 556, dependening
>> on the circumstances, for some period of time.
In my mail logs I find (excerpts):
A non-working phase:
Feb 18 18:33:02 mx1 courieresmtpd:
error,relay=::ffff:83.236.181.218,from=<[EMAIL PROTECTED]>,to=<welcom
[EMAIL PROTECTED]>: 456 Address temporarily unavailable.
Feb 18 18:34:36 mx1 courieresmtpd:
error,relay=::ffff:78.61.101.124,from=<[EMAIL PROTECTED]>,to=<[EMAIL PROTECTED]
.domain>: 456 Address temporarily unavailable.
Feb 18 18:36:30 mx1 courieresmtpd:
error,relay=::ffff:83.236.181.218,from=<[EMAIL PROTECTED]>,to=<welcom
[EMAIL PROTECTED]>: 456 Address temporarily unavailable.
Feb 18 18:36:52 mx1 courieresmtpd:
error,relay=::ffff:83.236.181.218,from=<[EMAIL PROTECTED]>,to=<welcom
[EMAIL PROTECTED]>: 456 Address temporarily unavailable.
Suddenly a working phase:
Feb 18 18:43:35 mx1 courieresmtp:
id=0000000000454157.0000000047B9C3C7.000053B8,from=<[EMAIL PROTECTED]
>,addr=<[EMAIL PROTECTED]>: 250 Ok. 0000000047B9C3C7.00003FC3
Feb 18 18:44:54 mx1 courieresmtp:
id=000000000045415F.0000000047B9C415.000054B8,from=<[EMAIL PROTECTED]>,
addr=<[EMAIL PROTECTED]>: 250 Ok. 0000000047B9C415.0000408F
Feb 18 18:50:04 mx1 courieresmtp:
id=0000000000454149.0000000047B9C54C.00005755,from=<[EMAIL PROTECTED]>,a
ddr=<[EMAIL PROTECTED]>: 250 Ok.
Then one failure (sender domain does not have an MX record):
Feb 18 18:52:49 mx1 courierd:
started,id=0000000000454003.0000000047B3991D.00004F6E,from=<revoltmarine.com
@pasaportemexico.com>,module=esmtp,host=recipient.domain,addr=<[EMAIL PROTECTED]
ient.domain>
Feb 18 18:52:50 mx1 courieresmtp:
id=0000000000454003.0000000047B3991D.00004F6E,from=<[EMAIL PROTECTED]
temexico.com>,addr=<[EMAIL PROTECTED]>: 417 DNS lookup failure:
pasaportemexico.com. Try again later.
Feb 18 18:52:50 mx1 courieresmtp:
id=0000000000454003.0000000047B3991D.00004F6E,from=<[EMAIL PROTECTED]
temexico.com>,addr=<[EMAIL PROTECTED]>,status: deferred
After that a non-working phase again:
Feb 18 18:56:05 mx1 courieresmtpd:
error,relay=::ffff:201.80.243.29,from=<[EMAIL PROTECTED]>,to=
<[EMAIL PROTECTED]>: 456 Address temporarily unavailable.
Feb 18 18:56:29 mx1 courieresmtpd:
error,relay=::ffff:190.78.126.169,from=<[EMAIL PROTECTED]>,to=<welcome@
recipient.domain>: 456 Address temporarily unavailable.
Feb 18 18:57:50 mx1 courierd:
started,id=0000000000454003.0000000047B3991D.00004F6E,from=<revoltmarine.com
@pasaportemexico.com>,module=esmtp,host=recipient.domain,addr=<[EMAIL PROTECTED]
ient.domain>
Feb 18 18:57:51 mx1 courieresmtp:
id=0000000000454003.0000000047B3991D.00004F6E,from=<[EMAIL PROTECTED]
temexico.com>,addr=<[EMAIL PROTECTED]>: 417 DNS lookup failure:
pasaportemexico.com. Try again later.
Feb 18 18:57:51 mx1 courieresmtp:
id=0000000000454003.0000000047B3991D.00004F6E,from=<[EMAIL PROTECTED]
temexico.com>,addr=<[EMAIL PROTECTED]>,status: deferred
Feb 18 18:59:12 mx1 courieresmtpd:
error,relay=::ffff:84.123.177.184,from=<[EMAIL PROTECTED]>,to=<[EMAIL PROTECTED]
nt.domain>: 456 Address temporarily unavailable.
It cannot be true that Courier blocks legitimate mail because of errors that
happened earlier. But I am lost here. I don't find an error in my
configuration. I did not find much info on this problem. Could someone give
a description when error 456 is triggered, what time values are behind
"temporarily unavailable", which settings to look at?
Regards
Dirk Kulmsee
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