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Thread: Alternative e-mail servers

  1. #1
    Funking Prink! Raz316's Avatar
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    Alternative e-mail servers

    Hiya.

    Is it possible to send e-mail through a secondary e-mail server, if the first one is not available?

    E.g.
    If the user can't connect to 192.168.0.80:25(110) try
    123.456.789.123:3336(3337) [i.e, an external IP address with port forwarding]

    I know we could just use VPN and tunnel in, but our connection isn't really suited to it, thanks!

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    Administrator Moby-Dick's Avatar
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    as far as I know not nativly with outlook.

    the only time that happens is when you are sending mail directly via smtp with multiple MX records.
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    Funking Prink! Raz316's Avatar
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    cheers moby,

    yeah thought so, tis a pity as well, VPN is such a connection drain! Especially with satellite latency :/

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    Administrator Moby-Dick's Avatar
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    What exactly are you wanting to do ?


    have you got 1 mail server or 2 ?

    is it internal or external clients you are trying to apply these settings to ?

    I think I might have a solution for you but I dont want to tell you unless I know what you are trying to achive
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    • Stoo's system
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    Advanced Direct Remailer can do that, if it fails x times it can auto send via isp, but the good bit is, you can set the isp server to anything you want..

    http://www.mailutilities.com/adr/?fadr_218

    I've been using it for years without a problem
    (\__/)
    (='.'=)
    (")_(")

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    Administrator Moby-Dick's Avatar
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    sounds good - I've been having a think and suspect that this is your situration.

    you have an internal mail server with a 192.168.0.x address
    it has port redirection from your router to an external ip.

    you want clients to use the same mail server regardless of where they are.

    simple solution to this is to use DNS.

    if your external conneciton has a dns name ie mail.company.co.uk

    make sure that your local DNS server has an entry for mail.company uk pointing to the internal Ip of the mail server.

    then set your outlook clients to pick up mail from mail.company.co.uk

    if you dont have an external DNs name , you can always set one up using www.no-ip.com
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    Funking Prink! Raz316's Avatar
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    Ahh yeah, would help if I explained... Right, here goes...

    The layout...
    Code:
    MailServer (192.168.0.80)
     |
    LAN (clients connect here when in office)
     |
    Satellite Modem (123.456.789.123 forwarding external port 3336 
     |               to internal 192.168.0.80:25 and external port
     |               3337 to internal 192.168.0.80:110
    Internet
     |
    Remote Clients (some have broadband, some have dialup)
    Certain users have laptops that can be taken out of the office with them. When in the office they connect to the lan normally and connect to 192.168.0.80 for their e-mail, currently when out of the office, they dial into our mailserver over the phone line (so limited to one user at a time, only one phone line).

    We have recently installed a 2mb satellite connection, and if we are able to use this for retrieving e-mail remotely, it would make everything a hell of alot more efficient and also, it will be much cheaper.

    My initial thought was use VPN, but with satellite latency this is a problem (especially if the user only have dialup internet their end!). The alternative was to set our satellite modem/router to forward certain ports to the internal mail server, e.g. 3336 for SMTP and 3337 for POP3. This works great, when the client is specifically told to send and recieve e-mail to the external IP address on the forwarded ports. However, when connected to the local network, you are unable to connect to these ports.

    So in essence, I need to tell the client software to use 192.168.0.8025/110) when on the LAN (or at least try this first) Or, use 123.456.789.1233336/3337) when not on the LAN (or if the first attempt fails).

    I hope that makes sense, and thanks!

    EDIT> Oo! Cheers Stoo, ill give it a look
    Last edited by Raz316; 02-12-2003 at 05:44 PM.

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    Administrator Moby-Dick's Avatar
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    see my post above ;-)
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    Funking Prink! Raz316's Avatar
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    Hah yeah, thats exactly it! ill give that a try too

    thanks you two!

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    Administrator Moby-Dick's Avatar
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    you're welcome
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

  11. #11
    Funking Prink! Raz316's Avatar
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    Just to say I got that sorted in the end

    Thanks for the input you 2.

    The local DNS was being a bit arsy with me, so in the end I created a virtual domain with our SME box specifically for woop.no-ip.org. Everything is much faster, can host multiple users at the same time, and even better, saves money!

    thanks again!

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    Administrator Moby-Dick's Avatar
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    Invoice is in the post

    better still if you need outsourced support in bucks then pm me

    /pimp
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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