Help please - 5.1.0 - Unknown address error 550

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weinberk
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Help please - 5.1.0 - Unknown address error 550

Postby weinberk » 2009-02-25 17:00

Hello-

I'm getting reports that when outside senders try to email our users, the >>sometimes<< get a bounce, with a message like this:

From: "Mail Delivery System" <MAILER-DAEMON@theirmailserver>

Date: 25 Feb 2009 14:50:13
To: <senderaddress@theirmailserver>
Subject: Delivery Status Notification (Failure)


The following message to <myuser@mydomain> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'Unknown user'

there's also an attachment that shows:

Reporting-MTA: dns; theirsmtpserver

Final-Recipient: rfc822;myuser@mydomain
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [myipaddress]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'Unknown user' (delivery attempts: 0)


Any ideas? I'm confused by the "delivery attempts: 0"

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Re: Help please - 5.1.0 - Unknown address error 550

Postby ^DooM^ » 2009-02-25 18:12

If their server is saying the user is unknown then the user is unknown. Enable SMTP Logging, replicate the issue and post the portion of the log that shows the unknown user bounce.
If at first you don't succeed, bomb disposal probably isn't for you! ヅ

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weinberk
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Re: Help please - 5.1.0 - Unknown address error 550

Postby weinberk » 2009-02-25 18:16

^DooM^ wrote:If their server is saying the user is unknown then the user is unknown. Enable SMTP Logging, replicate the issue and post the portion of the log that shows the unknown user bounce.


Thanks for the quick reply!

Any idea what the "delivery attempts 0" part is? The user definitely exists. Other mail works fine for her. it's sporatic from some.

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Re: Help please - 5.1.0 - Unknown address error 550

Postby ^DooM^ » 2009-02-25 18:17

Without looking at the log i cannot tell you anything that wasn't a pure guess.
If at first you don't succeed, bomb disposal probably isn't for you! ヅ

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Re: Help please - 5.1.0 - Unknown address error 550

Postby rekabis » 2010-01-18 10:31

I am currently experiencing a similar issue where a catch-all exists, but the catch-all isn't catching the e-mail, and it bounces with a similar issue:

Code: Select all

Final-Recipient: rfc822;rene@<domain>.com
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [24.67.64.36]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'Unknown user' (delivery attempts: 0)


I purposely used a non-existent email address to test the catch-all capabilities of the mail server. This is an issue that suddenly cropped up when migrating from 5.0 to 5.3.2. I *want* the catch-all to catch the e-mails; I *do not* want them to bounce back as undeliverable.

The hmailserver_2010-01-18.log shows the following:

Code: Select all

"SMTPD"   1828   78845   "2010-01-18 00:14:42.890"   "64.59.134.9"   "RECEIVED: EHLO idcmail-mo2no.shaw.ca"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.890"   "64.59.134.9"   "SENT: 250-mail.<domain>.net[nl]250-SIZE[nl]250 AUTH LOGIN"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.906"   "64.59.134.9"   "RECEIVED: MAIL FROM:<neo.geshel@shaw.ca> SIZE=2365"
"TCPIP"   1828            "2010-01-18 00:14:42.921"   "DNS lookup: 9.134.59.64.zen.spamhaus.org, 0 addresses found. Match: False"
"TCPIP"   1828            "2010-01-18 00:14:42.921"   "DNS lookup: 9.134.59.64.bl.spamcop.net, 0 addresses found. Match: False"
"TCPIP"   1828            "2010-01-18 00:14:42.921"   "DNS lookup: 9.134.59.64.dnsbl.sorbs.net, 0 addresses found. Match: False"
"DEBUG"   1828            "2010-01-18 00:14:42.921"   "Spam test: SpamTestDNSBlackLists, Score: 0"
"DEBUG"   1828            "2010-01-18 00:14:42.921"   "Total spam score: 0"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.921"   "64.59.134.9"   "SENT: 250 OK"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.937"   "64.59.134.9"   "RECEIVED: RCPT TO:<rene@<domain>.com>"
"DEBUG"   1828            "2010-01-18 00:14:42.953"   "AWStats::LogDeliveryFailure"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.953"   "64.59.134.9"   "SENT: 550 Unknown user"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.984"   "64.59.134.9"   "RECEIVED: RSET"
"DEBUG"   1828            "2010-01-18 00:14:42.984"   "Deleting message file"
"SMTPD"   1828   78845   "2010-01-18 00:14:42.984"   "64.59.134.9"   "SENT: 250 OK"


And the hmailserver_awstats.log shows the following:

Code: Select all

2010-01-18 00:14:42   neo.geshel@shaw.ca   rene@marshallsafety.com   64.59.134.9   127.0.0.1   SMTP   ?   550   0

FYI, I have obfuscated the domain names involved.

I should also point out that I used an external email account to send an email to a non-existent account on a domain which was handled by hMailServer. I had set up a catch-all account to handle emails like this, but for some reason it isn't working. This error began occurring the very minute I upgraded hMailServer from 5.0 to 5.3.1. I have ZERO clue as to why this is happening.

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Re: Help please - 5.1.0 - Unknown address error 550

Postby DanCML » 2010-01-18 13:52

rekabis, a similar topic was posted last week, and Martin stated that there is a problem with the catchall handling in 5.3.1. The 5.3.2 beta fixes this. However, in your last post you state you have 5.3.2, and then later that you have 5.3.1 - which is it?

The topic discussing this last week is here: viewtopic.php?f=7&t=17249&p=102278&hilit=beta#p102278

rekabis
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Re: Help please - 5.1.0 - Unknown address error 550

Postby rekabis » 2010-01-18 17:12

DanCML wrote:rekabis, a similar topic was posted last week, and Martin stated that there is a problem with the catchall handling in 5.3.1. The 5.3.2 beta fixes this. However, in your last post you state you have 5.3.2, and then later that you have 5.3.1 - which is it?

The topic discussing this last week is here: viewtopic.php?f=7&t=17249&p=102278&hilit=beta#p102278


Fore one, by the time I posted this it was so late at night that I probably skimmed right over that other thread and totally missed the reference (I really *had* made the effort to find a solution in the forums; really…).

For two, by the time I posted this it was so late at night I completely missed the 5.3.2 typo. Yes, I am running only 5.3.1. Thanks for the shout-out; I will try to install 5.3.2b later today.


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