问：
I need your assistance in one matter.

Our production support Manager Mr. X informed me that he often has problems to send mails to SHENZHEN Office even if we are sure that the addresses are correct. Our IT people can't find a problem on our side so maybe you can help us to find the reason.
Below you will find the original mail with the error message may you can help us to find out what's the meaning of the error message.
Have many thanks in advance and best regards.
Oct 11 07:55:19 smtp sm-mta[31912]: j9B5tIkx031912:
from=<prodsupport@xxx.de>, size=4854, class=0, nrcpts=5,
msgid=<OOEHIFGBKGOGHBGFNAMJOEDIDPAA.prodsupport@xxx.de>, proto=SMTP,daemon=MTA, relay=trotte.xxx.de [172.25.105.103]
Oct 11 07:55:20 smtp sm-mta[31912]: j9B5tIkx031912: Milter change (add):header: X-Virus-Scanned: by amavisd-new
Oct 11 07:55:31 smtp sm-mta[31912]: j9B5tIkx031912: Milter add: header:
X-Spam-Status: No, score=-3.2 required=4.9
tests=ALL_TRUSTED,AWL,BAYES_50,\n\tHTML_FONT_FACE_BAD,HTML_MESSAGE autolearn=no version=3.0.3
Oct 11 07:55:31 smtp sm-mta[31912]: j9B5tIkx031912: Milter add: header:
X-Spam-Checker-Version: XXX SpamAssassin 3.0.3 (2005-04-27) auf smtp.xxx.de
Oct 11 07:55:42 smtp sm-mta[31937]: j9B5tIkx031912:
to=<xxx@xxx.com>,<xxx@xxx.com>,<xxx@xxx.com>,<xxx@xxx.com
>,<xxx@xxx.com>, delay=00:00:23, xdelay=00:00:11, mailer=esmtp,
pri=244854, relay=mxmail.xxx.com. [219.133.37.205], dsn=5.0.0,
stat=Service unavailable
Oct 11 07:55:43 smtp sm-mta[31937]: j9B5tIkx031912: j9B5thkx031937: DSN:
Service unavailable

Oct 11 07:55:43 smtp sm-mta[31937]: j9B5thkx031937: to=<prodsupport@xxx.de>,
delay=00:00:00, xdelay=00:00:00, mailer=smtp, pri=36293,
relay=mail-dmz.xxx.de. [172.26.240.100], dsn=2.0.0, stat=Sent (HAA21704
Message accepted for delivery)

Error message :
.... while talking to mxmail.xxx.com.:
>>> DATA
<<< 554 5.7.1 Command rejected
554 5.0.0 Service unavailable

-----Ursprüngliche Nachricht-----
Von: Mail Delivery Subsystem [mailto:MAILER-DAEMON@xxx.de]
Gesendet: Dienstag, 11. Oktober 2005 07:56
An: prodsupport@xxx.de
Betreff: Returned mail: see transcript for details

The original message was received at Tue, 11 Oct 2005 07:55:19 +0200
from trotte.xxx.de [172.25.105.109]

----- The following addresses had permanent fatal errors -----
<xxx@xxx.com>
(reason: 554 5.7.1 Command rejected)
<xxx@xxx.com>
(reason: 554 5.7.1 Command rejected)
<xxx@xxx.com>
(reason: 554 5.7.1 Command rejected)
<xxx@xxx.com>
(reason: 554 5.7.1 Command rejected)
<xxx@xxx.com>
(reason: 554 5.7.1 Command rejected)

----- Transcript of session follows -----
.... while talking to mxmail.xxx.com.:
>>> DATA
<<< 554 5.7.1 Command rejected
554 5.0.0 Service unavailable

[-- Anhang #2: ATT00025.dat --]
[-- Typ: message/delivery-status, Kodierung: 7bit, Groesse: 1,1K --]

Reporting-MTA: dns; smtp.xxx.de
Received-From-MTA: DNS; trotte.xxx.de
Arrival-Date: Tue, 11 Oct 2005 07:55:19 +0200
Final-Recipient: RFC822; xxx@xxx.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mxmail.xxx.com
Diagnostic-Code: SMTP; 554 5.7.1 Command rejected
Last-Attempt-Date: Tue, 11 Oct 2005 07:55:42 +0200

Final-Recipient: RFC822; xxx@xxx.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mxmail.xxx.com
Diagnostic-Code: SMTP; 554 5.7.1 Command rejected
Last-Attempt-Date: Tue, 11 Oct 2005 07:55:42 +0200

Final-Recipient: RFC822; xxx@xxx.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mxmail.xxx.com
Diagnostic-Code: SMTP; 554 5.7.1 Command rejected
Last-Attempt-Date: Tue, 11 Oct 2005 07:55:42 +0200

Final-Recipient: RFC822; xxx@xxx.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mxmail.xxx.com
Diagnostic-Code: SMTP; 554 5.7.1 Command rejected
Last-Attempt-Date: Tue, 11 Oct 2005 07:55:42 +0200


答：

Hontonet email server have setup anti-spam and have rule as
following

1 when spammer send wrong email address , eg abcde@xxx.com and if abcde@xxx.com is not exist, this email will be reject by server
and sender's ip address will be recorded by server.

2 when recorded ip address send email to Hontonet later, if send to less than 5 email address, this email will be pass.But if send to more than 5 people(include 5), email will be rejected automatically.

3 recorded spam ip address will be refresh per 3 days, during this period if that ip address do not send wrong email address, will be removed automatically from server spam ip list.

4 Ip not in server spam ip list can send to any number of receipt

5 wrong email address mean any email address in receipt list, eg you send an email have 7 receipt to xxx.com, any wrong xxx.com in receipt will cause whole email be rejected and your ip address add in server spam ip list.

maybe somebody send wrong xxx.com address to Hontonet server and than ip have be record by server, and you send an email have more than 5 receipt.So this email have be rejected.

Now I have add xxx.de,xxx.de,xxx.com.hk to white list, email send from that address will not be reject even send to more than 5 receipt or wrong email address.

If you have other domain need add in white list, please let me know.

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