SMTP question

Posted on 2009-04-20
Last Modified: 2013-11-30
We currently use for our email hosting because they also handle our Blackberry Enterprise Server hosting.  This is working fine.  We have a few devices that need to send email such as network scanners, power monitors, etc.  For these devices, we have been using our internet providers smpt information (  We have changed internet providers to an ATT DS3 and since they are not providing email, they are not providing us an SMTP address to use.  For some devices, we can use authenicated login to Mailstreet's server but for a few devices, they do not allow authenicated login; they just have a space for the SMTP server.  If I try to use, it says no relaying allowed, which I understand.  I just don't know how to set these devices up to work anymore.

What should we do to make these devices work?  Host our own SMTP server?  I am at a loss.  Any help would be appreciated.

Question by:9thTee
    LVL 37

    Accepted Solution


    If the external SMTP requires authentication and your device doesn't support authentication, in this situation, about all you can do is host your own SMTP server. You can configure your SMTP server to allow anon connections then relay to the external SMTP server, using authentication. You should ensure that your SMTP server is not available from the outside by either restricting relaying to your internal subnet range or blocking inbound port 25 on your firewall.

    LVL 31

    Expert Comment

    How do your local machines send mail? Can't the devices use the same SMTP server?
    LVL 2

    Expert Comment


    You will not be able to relay through's mail servers but they will accept mail for email accounts which are hosted on their server.

    For instance, if you use the network scanner to email someone whose email address is then you can use's mail server but not if the scanner needs to send a message to

    Also, other than the smtp server field do you have an option for from and to fields?

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