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:
# mailq /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.) alfred@von-campe.com
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.
Alfred
On Jul 1, 2008, at 9:35 AM, Alfred von Campe wrote:
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.
1. make sure /etc/mail/sendmail.mc includes the following line:
define(`SMART_HOST', `your.local.smtp.host')dnl
as well as whatever other configuration is necessary for your site.
2. cd /etc/mail; make sendmail.cf; service sendmail restart
-steve
p.s. it is easier to configure Postfix to do this; the instructions are provided in the comments of /etc/postfix/main.cf.
-- If this were played upon a stage now, I could condemn it as an improbable fiction. - Fabian, Twelfth Night, III,v
Thanks for all the quick responses. Enabling SMART_HOST as well as masquerading did the trick. I also had to install the sendmail-cf RPM, but everything appears to be working now.
Alfred
Alfred von Campe wrote:
Thanks for all the quick responses. Enabling SMART_HOST as well as masquerading did the trick. I also had to install the sendmail-cf RPM, but everything appears to be working now.
You CAN manage without sendmail-cf RPM by editing the config file by hand. I wouldn't try it without a good psychiatrist and lots of medication to hand though! Goodness only knows what the sendmail guys were thinking of when they defined the config file specification.
Anyway, good to see you get it going.
Alfred von Campe 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:
# mailq /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.) alfred@von-campe.com
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.
In my write up of using sendmail with gmail I think I explain how to rewrite the from. If it's not there then look at the Sendmail/ Comcast write up:
http://www.linuxha.com/other/sendmail/gmail.html
I had to rewrite the from as being from gmail.com in order for gmail.com to accept the mail.
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.
Best to do that anyway. Some e-mail providers will only accept e-mail from known mail servers (AOL) and bounce if the IP of your sending server is not a static, known mailserver.
What you want is 'SMARTHOST'.
DSmy.mail.server.com in sendmail.cf
or
define(`SMART_HOST', `my.mail.server.com')dnl in sendmail.mc
Hi.
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.
Regards, lingu
On Tue, Jul 1, 2008 at 7:05 PM, Alfred von Campe alfred@von-campe.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:
# mailq /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.) alfred@von-campe.com
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.
Alfred
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