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Old 07-22-2003, 09:22 AM   #1
Registered: Jun 2003
Posts: 86

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Relaying Authorized users only in Sendmail???

Here is my orginal post over in security. I am not sure that is really the place for it so I thought I would try over here.

Anyway... I am running Sendmail on a Redhat 9 server. We do not allow relaying UNLESS you are on the allow list by IP Address. Not the best way to do it as I have heard but the only way I know how. Well now the boss demands that he be able to send e-mail while traveling. The problem is that he logs in to AOL when roaming and I can not add a dynamic ip to the list... and I can't relay for AOL... that would be really bad.

So what are my options? how can I make this work? I have looked at many of the pages... but the reality is... I need something quick and easy. I am totally self taught and have not taught myself this. I am under tremendous pressure to get it done yesterday and I have a massive workload already.

Any help is greatly appreciated...
Old 07-22-2003, 09:37 AM   #2
Senior Member
Registered: Mar 2003
Location: Beautiful BC
Distribution: RedHat & clones, Slackware, SuSE, OpenBSD
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how about a web-frontend - like SquirrelMail or Horde.

Not sure if sendmail has a feature where an authorized user can RELAY.

Last edited by ppuru; 07-22-2003 at 09:39 AM.
Old 07-22-2003, 09:45 AM   #3
Registered: Jul 2003
Distribution: Red Hat
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This might be of interest to you mark
Old 07-22-2003, 09:48 AM   #4
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Registered: Jul 2003
Posts: 14

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Try using a Dynamic DNS service for your mobile users.

Threre's a couple of free DDNS services out there that let you have a host name you can use to for this. Basicly the way it works is - you create a host name like "" and everytime the IP address for "" changes it will update the DDNS server so you can alway reach that mobile user regardless of IP change. Eventually in order for this work your mobile user needs to install a small program that will constantly look for any IP address change. Once it finds an ip address change it will update the server to reflect the new ip address. I think it takes like a three minutes or so to get the new changes.

Since you're only allowing your mobile user to relay by ip address or host name. All you need to do is add that host name to your list. This way all you need to do is have the host name there regardless of any ip address change. It makes like easier doesn't it?

Here's the link: NO-IP DDNS

Go for the free setup and register. Once you're there just create the host name, and make sure you download the program onto you're bosse's laptop. Here's a tip: make sure you set the program to automaticly start on startup, this way the IP address is always updated when your Boss dials up.

Old 07-22-2003, 10:03 AM   #5
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That is an informative link, webnoelle.


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