Hi.
We have decided that only local users should be
allowed to send e-mails to local mailing lists, i.e.,
non-local users must not send e-mails to mailing
lists. In simpler words: users that are not allowed to
relay must not be allowed to send e-mails to local
mailing lists.
As all mailing lists must be open (ClosedML=0), we
have implemented a filter to block (based on the
source IP) those kind of e-mails.
In order to improve the process, we are now testing a
very simple patch to SMTPSrv.cpp (v 1.21) which denies
access to mailing lists during the SMTP session. I
would appreciate very much any considerations you may
have about this idea and the patch, which follows this
message.
Thanks in advance.
Regards.
--- SMTPSvr.cpp 2005-12-14 10:05:07.718125752 -0200
+++ SMTPSvr.new.cpp 2005-12-14 10:04:48.557038680
-0200
@@ -1638,10 +1638,11 @@
///////////////////////////////////////////////////////////////////////////////
// Check if client can post to this mailing list
///////////////////////////////////////////////////////////////////////////////
- if (UsrMLCheckUserPost(pUI,
SMTPS.pszFrom,
+ if ((SMTPCheckRelayCapability(SMTPS,
szDestDomain) < 0)
+ || (UsrMLCheckUserPost(pUI,
SMTPS.pszFrom,
IsEmptyString(SMTPS.
szLogonUser) ? NULL :
-
SMTPS.szLogonUser) < 0) {
+
SMTPS.szLogonUser) < 0)) {
ErrorPush();
UsrFreeUserInfo(pUI);
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