Configuring sendmail in a corporate environment
* First of all check the connectivity from that server to the external domains like gmail,yahoo.com by doing telnet on port 25.if* u get connected then then ur firewall is not blocking any outgoing port 25 connection.
* Then you have to check one more parmeter.If your domain* on ur sendmail server is registered with the internet then only you can send a mail to any external domains.If you are not registered your ip wil get blacklisted in the spam database.
*Incase if your are registered if it is an direct mx then no need to set any relay server parameter in sendmail.Incase your MX is pointed to some third party then you have to tell the relay server ip in sendmail mc file.it wll be some thing like below
dnl define(`SMART_HOST', `smtp.your.provider')dnl
Replace smtp.your.provider with mx2.example.com,this is where your mx get pointed so that all of your outgoing mails will relayed via this server.
dnl define(`SMART_HOST', `mx2.example.com')dnl
Note: check the connectivity from that centos sendmail server to mx2.example.com first for port 25 connection.
On Tue, Jul 1, 2008 at 7:05 PM, Alfred von Campe <email@example.com> wrote:
I have a stock CentOS 5 system as far as email (sendmail) is concerned that is on our corporate LAN. *I am not trying to set up a mail server; I merely want our CentOS systems to be able to send out emails. *This works as long as the recipient's domain is our local domain. *Any email send to recipients that are not in our local domain get stuck in the queue:
* * * * * * * */var/spool/mqueue (2 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
m61D6wC1029257 * * * 16 Tue Jul *1 09:06 <XXXX@XXXX.XXXX.com>
* * * * * * * * (Deferred: Connection timed out with mx2.emailsrvr.com.)
* * * * * * * * * * * * * * * * * * * * <firstname.lastname@example.org>
It appears that our firewall is not allowing connection to outside MX hosts. *I think I need to configure sendmail to forward emails to our local smtp host, but I am not sure how to do that.
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