Sendmail Relay – How to Set Up Sendmail Relay Out of Amazon EC2

PHPsendmailsmtp

I have a site running on CentOS 5.4 through Amazon EC2. Unfortunately, Amazon has had nothing but trouble with their entire IP range getting black listed from spam tracking services regularly. I need a mail server, so I setup an smtp server elsewhere that I want to send to, but I can't just send directly to it through PHP because the direct smtp request is way too slow. What I want to do is relay through sendmail, but I've never used sendmail before, so I have no idea how to configure it. All I want is for all emails sent from localhost to be relayed to one specific external server, but I don't know how to do that. I tried to find a tutorial online, but couldn't find anything that was particularly clear as to how I go about doing that. Can anyone help me out?

Best Answer

The sendmail feature you need to configure is mailertable. Here are simple config instructions after a base install of Sendmail.

Mailertable: http://www.cyberciti.biz/faq/force-sendmail-to-route-mail-to-specific-hosts-or-mailserver/ Sendmail full Monty minus mailertable http://www.howtoforge.com/squirrelmail-configuration-easy-steps-squirrelmail-sendmail-apache-redhat-centos-fedora

If this doesn't work for you I'd recommend using installing webmin to configure the install. I would I highly recommend configure your firewall for outbound email.

Related Solutions

Linux – Fastest way to allow sendmail relay through smarthost

You have specified answer in the question itself. You can do that using

define(`SMART_HOST', `smtp.your.provider')dnl

Are you facing any problem using this. After editing /etc/mail/sendmail.mc you should go to directory /etc/mail. Type make and then restart sendmail service for changes to take effect. Then send a test mail and see message headers (Received:) to see if configuration worked.

Exim Sendmail Configuration – Relay Setup Guide

In the routers section of your exim config, you'll have a router that looks something like this:

 lookuphost:
    driver = lookuphost
    transport = remote_smtp

This is what tells exim to deliver mail directly. You need to tell it to use the smarthost instead.

Replace the above router with something like this:

 smarthost:
   driver = manualroute
   domains= ! +local_domains
   transport = remote_smtp 
   route_list = *  smtp.ultrahosting.com  byname
   host_find_failed = defer
   no_more

Make sure that the transport name in the new router is the same as in the original (remote_smtp in this example).

Also, you'll need to restart exim after making these changes.

Best Answer

Related Solutions

Linux – Fastest way to allow sendmail relay through smarthost

Exim Sendmail Configuration – Relay Setup Guide

Related Topic