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HCSHAW
 asked on

SMTP SERVER setup

Background:
We are moving from an exchagne server to google apps.  All is going well.

Previously all out severs pointed to the Exchange server for sending out mail for our notification messages (such as "Service xxx was restarted".      I have set up the SMTP server to now just send the mail to the receipent domain.  It is set up on my SQL server.   It works, but a couple of questons are nagging at me.

1) When sending mail to another domain, the other mail server may do a reverse lookup to insure that the sender is who they say they are.  But I am unclear how this will work now.
As an example, I send mail to xyz.com from my smtp server located locally at 12.12.12.12.  Our mydomainname.com  resolves to 55.55.45.45.    Will the SMTP mail be rejected?

2) What exactly is a smart host.  It was setup to point to our exchange sever which now is going away, I blanked it, and the smtp sends fine to the outside email server.  Should I set this to the google smtp.google.com server address now?

Thansk for any guidance on this .
Email ProtocolsMicrosoft IIS Web ServerWindows OSMicrosoft SQL Server

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HCSHAW

8/22/2022 - Mon
lruiz52

You should be ok, because when you send mail it will be sent from google servers, the reverse DnS settings on your side won't come into play.

A smart host server that acts as an intermediate gateway before sending messages to their final destination. For reference on smart host check link below..

http://technet.microsoft.com/en-us/library/gg430178.aspx
HCSHAW

ASKER
Thanks for the info.   I don't think the local SMTP will be sending to the Google SMTP server the way I have it configured.  But I'm new to this and maybe have overlooked something.

Why would the SMTP send to Google and not make the connection directly with the recipient email server?  I'm guessing you have to point it to the smtp.google.com to make that happen and I haven't done that anywhere.  

Here is an overview of what I am trying to accomplish.   Our email was in house.  Our servers would send reports using blat which pointed them to the exchange for handling the mail.   When we would have a WAN outage, the emails would pile up until the connection is restored and then get sent.   Now, with no exchange, I was trying to use the SMTP to queue up the messages and if the WAN went down, they would just hold until it came back up.   If I point to the SMTP.Google.com and the WAN is down the sending message would not be able to get through and I fear it would be lost.  I don't want to take a chance on losing these messages.  I was thinking a local SMTP would solve that problem.

Your thoughts?
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Bud Durland

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Jian An Lim

the issue that it has is not about reliability of the google smtp but the local Internet services.
Your help has saved me hundreds of hours of internet surfing.
fblack61
HCSHAW

ASKER
Thanks to all for contributing.  Several good answers in the mix, but  hats off to vadimrapp for summing it up to the orignial question(s).  and  BudDurland for clearly explaning the Smart host set up reasoning and  limjianan for the excellant links.