com ERROR: Stop spamming us
When this address arrives from the outside, the SMTP will look like this:
MAIL From:
553 5.3.0 ... Stop spamming us
7.5.2.8 ERROR:D.S.N:XYZ text
This righthand value is the same as ERROR:XYZ text, but it allows you finer control of
the SMTP rejection message.* The D.S.N can be any of the DSN codes defined in
RFC1893. You should use this form if you change the SMTP code from the default
used by sendmail:
newsupdates@your.domain 450 Cache mailbox disk is full
Here, for example, you reject mail to newsupdates at your site because the database is
down, so you cannot drain the cache file. By changing the SMTP error from its
default, you will cause sendmail to wrongly report the DNS error:
RCPT To:
450 4.0.0 Cache mailbox disk is full
* In support of the examples in this section, we are assuming the FEATURE(blacklist_recipients) (?§7.5.5 on
page 284) has also been declared so that the access database can reject mail to specific local recipients.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
282 | Chapter 7: How to Handle Spam
The 4.0.0 is not the correct DSN code for a full mailbox. Instead, you should specify
4.2.2, like this:
newsupdates@your.domain ERROR:4.
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