Nonexistent Users

[Alan Dobkin]

Jim,

Ideally, your MTA (Postfix, Sendmail, etc.) should reject mail to 
non-existent accounts during the initial SMTP transaction, before 
MailScanner ever sees it. See page 8 of the MailScanner guide book for 
an overview of how it works, available here:
https://s3.amazonaws.com/mailscanner/docs/ms-admin-guide.pdf

If you provide more details on your server configuration, someone here 
may be able to point you in the right direction. For example, with 
Postfix, see:
http://www.postfix.org/SMTPD_ACCESS_README.html

> Rejecting mail for a non-existent recipient address. This form of 
> ingress filtering helps to keep the mail queue free of undeliverable 
> MAILER-DAEMON messages. This requirement is enabled by default 
> ("smtpd_reject_unlisted_recipient 
> <http://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_recipient> 
> = yes").

If you are relaying for other mail servers, you may also want to enable 
recipient address verification:
http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient

Alan

On 5/6/2016 9:45 AM, Jim Wirtz wrote:
>
> Is there a way to configure  MailScanner to not process email to 
> nonexistent users/accounts?
>
> My server spends a lot of CPU time  to check/process emails that are 
> just going to be deleted.
>
> Thanks....
>
> Jim
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mailscanner.info/pipermail/mailscanner/attachments/20160506/834fbd0a/attachment.html>