A bit of clarification first: the MX record tells a mail server which IP(s) are responsible for receiving mail for a certain domain. If there's no mail server listening there, or if it's configured wrong, you'll still get no mail.
You have to configure the MX record in the authorative DNS server for your domain. How that's done depends on which one you use. For BIND you'd have to put a line like
or
in the appropriate zone file & reload the configuration.
what are the files needed for the installation of a dns server on linux (redhat 7x)? what service does it run and where are the files & services located? (1 Reply)
hello
i am running my sipx server in 192.168.2.14
i would like to configure domain name and host name for this .....
can anyone tell me how to configure dns server and dhcp server so that any body both outside and inside the lan could access the sipx server by their host.domain.com name (1 Reply)
Hi everybody,
for revolving local host name of my network, I set up an dns server to solve my problem, but til now, nothing happen when I ping a hostname, but work on IP. Can you help me to correct the configuration. Here is all my settings:
Voici mes fichiers de configuration:
-... (2 Replies)
Hy guys, I've a problem configuring my Name Server (using bind 9) which is I'ts always necessary to put all slave Name Server for a zone in the zone resource record file or db (as you prefer)?
I've this scenario:
A - my domain which is son of some TLD and I delegated into two new domains B... (1 Reply)
Hi,
I have a question on how to point the DNS server-1's A-record to second DNS server, which is DNS server-2. So, the computer can access other domain which only listed in the DNS server-2. The scenario is as follow:
http://img689.imageshack.us/img689/6333/12234.png
How to configure this... (4 Replies)
I need to create a new internal DNS CNAME record called "project.omc.eod" that points to a server called SPARC27.ds.eod. This is my first time doing this and any help would be greatly appreciated. Thanks in advance (10 Replies)
Can someone help with a detail step-by-step oh how to configure DNS server on Linux Server.
-
I need to have 3 IP addresses map to a single hostname.
for clients
I'm a Linux rookie.
Thanks
Oscar (1 Reply)
Hi,
I have recently built a new DNS server and created a new zone.
I use an ESMTP server to handle mail and the new domain has been added to this.
I can send mail to gmail and other domain addresses but unable to send it to one particular domain. (DSN:Service Unavailable)
DNS... (2 Replies)
Hi guys,
I had Cpanel VPS hosting and switched to non managed VPS hosting.
My nameservers are configured as follows
ns1.mobz.ca 69.175.76.110
ns2.mobz.ca 69.175.76.111
Before switching my domain worked perfectly. Like webprofessionalsconnect.com with those settings worked. With new... (4 Replies)
Hi
I have a DNS server running on Solaris 5.10, I need to update ip address of two urls defined on our dns server how do i do that?
and do i need to restart dns/named service after? how do i restart the service?
Thanks (4 Replies)
Discussion started by: arocker
4 Replies
LEARN ABOUT DEBIAN
smtpdcheck
smtpdcheck(1) Mail Avenger 0.8.3 smtpdcheck(1)NAME
smtpdcheck - check SMTP servers
SYNOPSIS
smtpdcheck [--stop {ip-addr|name}] [--timeout seconds]
[prio:]server [[prio:]server]
DESCRIPTION
smtpdcheck checks to see if SMTP servers are available. The intent is for use on secondary mail servers, which have no reason to accept
mail when the primary server is available.
The argument consists of a list of server names, each of which may optionally be prefixed by a numeric MX priority and a colon. (This is
exactly the format for MX records returned by the avenger dns command.) smtpdcheck will attempt to connect to each server in succession.
If one of the servers specified on the command line is available, smtpdcheck will print its name to standard output and exit with status 1.
If smtpdcheck cannot connect to any of the servers, it will exit with status 0. If a system error occurs, smtpdcheck will exit with status
2.
OPTIONS
--stop {ip-addr|name}
Tells smtpdcheck to stop before checking a server with IP address ip-addr or hostname name. If such a host is encountered in the list
of servers and prio is specified, then smtpdcheck will consider it acceptable for other servers with the same priority to be available,
even if those servers were first in the list. In other words, given the following arguments:
smtpdcheck --stop s2.domain.com
10:s1.domain.com 10:s2.domain.com
20:s3.domain.com
This command will always succeed, regardless of whether "s1.domain.com" is up, because "s2.domain.com" has the same priority. On the
other hand, the following command will fail and output "s1.domain.com" if "s1.domain.com" is up:
smtpdcheck --stop s2.domain.com
10:s1.domain.com 20:s2.domain.com
30:s3.domain.com
If a gethostbyname lookup for the argument name fails, smtpdcheck will exit immediately with status 2.
--timeout {seconds]
By default, smtpdcheck spends 10 seconds probing each server. This includes the time to do a DNS lookup, to establish a TCP connection
to port 25 of the server, and to read the "220" SMTP code from the server's SMTP greeting message. To use a different value, specify
it with the --timeout option. The value 0 disables the timeout completely, which is dangerous since smtpdcheck might then end up
waiting forever to read the "220" string.
EXAMPLES
To refuse to relay mail at a secondary MX server when the primary server is not down, you might place the following in
/etc/avenger/secondary (assuming MxLocalRcpt is 1):
dns RECIP_MXES mx "$RECIPIENT_HOST"
setvars
server=`smtpdcheck --stop $MYIP $RECIP_MXES`
test -n "$server" && defer "Please use server $server"
SEE ALSO avenger(1)dbutil(1)asmtpd.conf(5),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
smtpdcheck could achieve much lower latency by probing all the servers simultaneously. It should also include some kind of caching, to
avoid repeatedly trying to contact an unavailable server. Finally, hosts with multiple IP addresses could be handled more cleanly, though
what smtpdcheck does should probably work in most cases.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 smtpdcheck(1)