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From Ned on Info-IMS:
It turns out the capabilility is already there, even as far back as 5.2. I'm a
little unsure why it isn't documented, but setting bit bit 5 (value 16) of
returnenvelope causes exactly such a check to be performed.
How Can I Block Mail From Bogus Local Addresses?
There's no sense in allowing spammers to use obviously fake local email addresses in the envelope from. Here's how to configure Messaging Server to require that the envelope from addresses uses a valid uid in local domains.
Add the following to mappings:
FROM_ACCESS
!
! Prevent envelope from addresses that use invalid users in local domains
!
TCP|*|25|*|*|SMTP*|*|tcp_local|*|* $C$|INVALID_LOCAL_USER;$5|$NInvalid$ from$ address$ ($5).$E
INVALID_LOCAL_USER
*@* $C$|NONLOCAL_DOMAIN;$1|$N$E
*@* $C$|SMARTHOST_DOMAIN;$1|$N$E
@*:* $C$|VALID_ACCOUNT;$1|$N$E
@*:* $Y$E
* $C$|VALID_ACCOUNT;$0|$N$E
* $Y$E
NONLOCAL_DOMAIN
* $C$}$0,_domain_name_{$N$E
* $Y$E
SMARTHOST_DOMAIN
! override some domains (these are alias domains of smarthost domains)
mail.department.school.edu $Y$E
alias.organization.net $Y$E
* $C$]ldap:///o=internet??sub?(&(inetDomainBaseDN=o=$0,o=isp)(|(mailroutingsmarthost=*)(mailroutinghosts=*)))[$Y$E
* $N$E
VALID_ACCOUNT
* $C$]ldap:///o=isp?mail?sub?(|(mail=$0)(mailalternateaddress=$0)(mailequivalentaddress=$0))[$Y$E
* $N$E
Comments (1)
Aug 11, 2008
DerekDiget says:
I asked the Info-iMS mailing list about this page. It looks like this functiona...I asked the Info-iMS mailing list about this page. It looks like this functionality is already in Sun Messaging Server and has been since the version 5.2 days. The problem is that the setting was not documented.
The channel keyword is returnenvelope and its bit 4 (value 16) setting is the one of interest. See [Info-iMS] How Can I Block Mail From Bogus Local Addresses? for more information.