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Exchange 2003 with recent Patches block previously working email from trixbox

slickrock
Posts: 245
 Member Since:
2006-05-31
Submitted by slickrock on Fri, 10/19/2007 - 10:10am.

I am using the standard Sendmail setup to send vm and faxes to users. After an update last week for Exchange 2003, the Sender ID feature that has always been enabled, received some type of update that disallows the emails from trixbox. When I disable Sender ID under exchange, all the emails work again, enable it and they stop working.

How can I continue to use Sedner ID on exchange 2003, but allow Trixbox emails through. I have Webmin installed and can see the emails that are sitting in cue.

Thanks

Ryan

‹ Config files not updating Need help removing Trixbox Dynamic UI from Kennonsoft.org ›

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hdallen55
Posts: 153
 Member Since:
2006-10-08
SPF record
Fri, 10/19/2007 - 11:02am

Ryan,

Sender ID filtering relies on Exchange being able to lookup an SPF record in DNS for the mail servers that are sending mail. There are also a couple of hotfixes that are recommended if you are using sender ID filtering on Exchange 2003. They are mentioned in kb articles 905214 and 927478.

Hope this helps.

Doug
www.vbcnetworks.com


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slickrock
Posts: 245
 Member Since:
2006-05-31
thanks for the response.
Fri, 10/19/2007 - 12:17pm

thanks for the response. Those have been applied previously.


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hdallen55
Posts: 153
 Member Since:
2006-10-08
record created?
Fri, 10/19/2007 - 1:33pm

Ryan,

Sorry for sending info you already have. Just to be clear, in addition to the fixes, do you also have an SPF record (or TXT record with SPF information) in DNS that says the tb server can send e-mail for your domain? Sorry again if this is redundant information.

Doug
www.vbcnetworks.com


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slickrock
Posts: 245
 Member Since:
2006-05-31
I do not think so and no
Fri, 10/19/2007 - 1:57pm

I do not think so and no need to be sorry I truly appreciate your help. Where in the DNS do I make that change?

Thanks!!


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hdallen55
Posts: 153
 Member Since:
2006-10-08
Depends on internal or external
Fri, 10/19/2007 - 2:12pm

The SPF record is what makes Sender ID filtering work. It's essentially a DNS record that states specifically which servers are authorized to send mail for your domain to cut down on e-mail spoofing. Some DNS servers allow an SPF record to be created; many don't have an option for SPF so you create a TXT record that contains the SPF information. Much more information here - http://www.openspf.org/ - and here - http://en.wikipedia.org/wiki/Sender_Policy_Framework

As for where to create this it depends on which DNS server you are using and where it's located in your network. If you are using an internal DNS server to answer requests for your LAN, and your Exchange box on on your network queries that server for name resolution (normally in a Microsoft AD domain, you would have an internal DNS server), that is where you need to create the SPF record for your tb. The rest of the world will probably never receive e-mail generated from the tb (only your Exchange server) so there would be no need to create an SPF record on the "live" DNS server for your Internet domain.

Hope this helps,

Doug
www.vbcnetworks.com


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