03-09-2015
[sendmail] One Spam Per Day..
Hi,
I have sendmail 8.14.4 on a CentOS 6.6-RELEASE virtual machine. This box is primary MX for our domain, and everything is swell.
Every single day, one spam gets through. This spam has the 'From' address '<>', and my google search reveals that blocking the null sender is not a good idea.
In my sendmail.mc, I have:
dnl FEATURE(`enhdnsbl',`sbl-xbl.spamhaus.org',`"Message from "$&{client_addr}" rejected - see: http://www.spamhaus.org/sbl"
But this blocks e-mail from two of our clients.
One spam per day isn't that bad, but it's frustrating that I can't stop it. The IP is different every day. The e-mail always comes from 'david[randomcharacters]@something.com, so I can't block 'david,' because that will stop legitimate e-mails.
I think that this is a job for procmail, but reading the recipes, they look like they were written in postgrad maths.
Can someone help?
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LEARN ABOUT OPENSOLARIS
domainname
domainname(1M) System Administration Commands domainname(1M)
NAME
domainname - set or display name of the current domain
SYNOPSIS
domainname [name-of-domain]
DESCRIPTION
Without an argument, domainname displays the name of the current domain name used in RPC exchanges, usually referred to as the NIS or NIS+
domain name. This name typically encompasses a group of hosts or passwd entries under the same administration. The domainname command is
used by various components of Solaris to resolve names for entries such as are found in passwd, hosts and aliases. By default, naming ser-
vices such as NIS and NIS+ use domainname to resolve names.
With appropriate privileges (root or an equivalent role [see rbac(5)]), you can set the name of the domain by specifying the name as an
argument to the domainname command.
The domain name for various naming services can also be set by other means. For example, ypinit can be used to specify a different domain
for all NIS calls. The domain name of the machine is usually set during boot time through the domainname command by the svc:/system/iden-
tity:domain service. If the new domain name is not saved in the /etc/defaultdomain file, the machine reverts to the old domain after it
reboots.
The sendmail(1M) daemon, as shipped with Solaris, and the sendmail implementation provided by sendmail.org (formerly referred to as "Berke-
ley 8.x sendmail") both attempt to determine a local host's fully qualified host name at startup and both pursue follow-up actions if the
initial search fails. It is in these follow-up actions that the two implementations differ.
Both implementations use a standard Solaris or Unix system call to determine its fully qualified host name at startup, following the name
service priorities specified in nsswitch.conf(4). To this point, the Solaris and sendmail.org versions behave identically.
If the request for a fully qualified host name fails, the sendmail.org sendmail sleeps for 60 seconds, tries again, and, upon continuing
failure, resorts to a short name. The Solaris version of sendmail makes the same initial request, but then, following initial failure,
calls domainname. If successful, the sleep is avoided.
On a Solaris machine, if you run the sendmail.org version of sendmail, you get the startup behavior (omitting the domainname call)
described above. If you run the Solaris sendmail, the domainname call is made if needed.
If the Solaris sendmail cannot determine the fully qualified host name, use check-hostname(1M) as a troubleshooting aid. This script can
offer guidance as to appropriate corrective action.
FILES
/etc/defaultdomain
/etc/nsswitch.conf
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
NIS+(1), nischown(1), nispasswd(1), svcs(1), check-hostname(1M), hostconfig(1M), named(1M), nisaddcred(1M), sendmail(1M), svcadm(1M),
ypinit(1M), sys-unconfig(1M), aliases(4), defaultdomain(4), hosts(4), nsswitch.conf(4), passwd(4), attributes(5), rbac(5), smf(5)
NOTES
The domainname service is managed by the service management facility, smf(5), under the service identifier:
svc:/system/identity:domain
Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser-
vice's status can be queried using the svcs(1) command.
SunOS 5.11 8 Mar 2006 domainname(1M)