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Sender ID and Postini

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Sender ID and Postini - 19.May2008 11:17:14 AM   
mia450r

 

Posts: 77
Joined: 28.Jun.2006
Status: online 		Hi,

Are there any problems/gotchas/considerations with enabling Sender ID when my company uses Postini ?  (Exchange 2003/sp2)

thx
m
Post #: 1
RE: Sender ID and Postini - 19.May2008 11:24:53 AM   
uemurad

 

Posts: 5485
Joined: 7.Jan.2004
From: California, USA
Status: offline 		Please explain if you have something different  in mind, but the only reference I found at Postini regarding Sender ID was this:
http://www.postini.com/webdocs/presentations/redirects/webinar_12_14_06_faq.html

Inside the transcript was this Q&A:

What is your opinion of sender ID? Postini do SPF validation?
Postini has investigated SPF and has decided not to implement it as a feature
for inbound mail processing. Implementing SPF would add significant
processing overhead without adding any appreciable effectiveness to the
spam filtering. Almost all mail that would be blocked by SPF are also identified
as spam by our spam filters. In addition, Postini tracks the IP addresses of
Fortune 500 corporations and the most popular internet sites such as Yahoo,
Hotmail, eBay, etc. Adding these domains to the Approved Senders list,
particularly at the organization level, is not usually needed and can result in
spam appearing to be sent from those domains inadvertently getting to users'
mailboxes.




_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to mia450r)
Post #: 2
RE: Sender ID and Postini - 19.May2008 11:30:05 AM   
mia450r

 

Posts: 77
Joined: 28.Jun.2006
Status: online 		Thanks for the link....

I was just curious if it would be worthwhile/recommended to enable Sender-ID if my company uses Postini....

thank you.
m

(in reply to uemurad)
Post #: 3
RE: Sender ID and Postini - 19.May2008 2:24:43 PM   
mia450r

 

Posts: 77
Joined: 28.Jun.2006
Status: online 		Also,
Since Postini only handles our inbound mail, I wasn't certain on the proper format of the SPF record(s) we should add to DNS....

m

(in reply to mia450r)
Post #: 4
RE: Sender ID and Postini - 20.May2008 1:10:00 AM   
uemurad

 

Posts: 5485
Joined: 7.Jan.2004
From: California, USA
Status: offline 		Your SPF record will only affect outbound mail, since you are identifying yourself.  For more information about the format, check the website at: http://www.openspf.org/

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to mia450r)
Post #: 5
RE: Sender ID and Postini - 20.May2008 8:14:14 AM   
mia450r

 

Posts: 77
Joined: 28.Jun.2006
Status: online 		What about bounces that Postini handles for us.... Due to that, dont we need to identify our MX (Postini servers) in our SPF records ?

thank you ...
m

< Message edited by mia450r -- 20.May2008 8:57:42 AM >

(in reply to uemurad)
Post #: 6
RE: Sender ID and Postini - 20.May2008 4:38:04 PM   
secureemailplus

 

Posts: 6
Joined: 20.May2008
Status: offline 		Postini's info to add to your SPF for outbound services, include:spf.postini.com
Add an additional servers that may deliver email using your domain and or IP.



(in reply to mia450r)
Post #: 7
RE: Sender ID and Postini - 8.Jul.2008 1:41:42 PM   
mia450r

 

Posts: 77
Joined: 28.Jun.2006
Status: online 		What about Sender ID?  On the general tab, where you list all of the internal and perimeter-based SMTP-handling IPs--should I specify all of the Postini servers? (as I did for the SPF record)

Again, all of our inbound mail comes from Postini....

thanks!
mia

(in reply to secureemailplus)
Post #: 8
RE: Sender ID and Postini - 8.Jul.2008 3:29:36 PM   
uemurad

 

Posts: 5485
Joined: 7.Jan.2004
From: California, USA
Status: offline 		If Postini sends mail directly to your Exchange server(s), then adding the IP address ranges for Postini will allow those messages to bypass the filtering.  That's probably what you want to do, so yes - add the addresses.


_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to mia450r)
Post #: 9

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