Re: Reason for mail sending fails ???

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"calderara" <calderara@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:26E52AC0-F30F-45EF-A9C2-43BE87558483@xxxxxxxxxxxxxxxx
If POP 3 connector is only use to recieve email, how my email can be
delivered to my private mail box from my laptop outlook client through my
exchange server ?

What do you mean by smarhost ???

SBS has two ways of sending email:

The first is for each email SBS (or rather Exchange - the software running on SBS) does the delivery itself. So it looks up the domain that the email goes to, tries to contact the email server at that domain to deliver the email, and retries if it was unsuccessful.

The second is to use a "smarthost". A smarthost is simply a way of delegating the delivery to another server. Typically the smarthost is set up to point to your ISP's SMTP server. Each time you send an email that email is forwarded to the smarthost (i.e. your ISP) for delivery.

Out of the box I think it doesn't use a smarthost (but its been a while since I last installed SBS). Somewhere along the way it may ask if you want to use a smarthost, so if you entered your ISP's SMTP server then it might be otherwise it won't.

However, in order to tell for sure which you are using try this:

Start > All Programs > Microsoft Exchange > System Manager
Expand "Connectors"
Right click "SmallBusiness SMTP connector" and select "Properties"
On the "General" tab you will have one of the following selected:
( ) Use DNS to route to each address space on this connector
(*) Forward all mail through this connector to the following smart hosts

Why might you want to use a smarthost? There are other reasons but typically its if your IP address is on one or more blacklists (which it may be if its a dynamic or domestic ip for example). A smarthost isn't always a good idea, for example where I am now we don't use a smarthost because our ip isn't on any blacklists (afaik) whereas our isp's smtp server is.

I think that answers both of your two questions.

Sorry for basic questionbut I am not familar with all this

Not a problem.

Now, my best guess a the cause of your problem:

I suspect that you are not using a smarthost, but your Exchange server is sending out emails itself. Since (in a reply to Russ) you mentioned that your SBS server is at home it is quite likely that your home IP address is on one or more blacklists. Some blacklists list IP addresses that are allocated for home internet connections. (The rational being that most home users don't send emails directly but via their ISP so any emails coming from a home internet connection are more likely to be spam.)

If your IP address is on a blacklist then some recipients will receive your emails whilst others won't. Whether or not they receive your email depends on which blacklists their email system uses.

The work around is simply to enable a smarthost and get your Exchange server to use your ISP's STMP connection - this is the same connection that you will have used before you installed SBS.

Hope this helps.
--
Brian Cryer
www.cryer.co.uk/brian

.

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