Exchange & Outlook UPDATE, Exchange Edition, August 12, 2004


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1. Commentary
- SURBLs: The Upside of Sharing Spam

2. Resources
- Featured Thread: Solution for Sharing Contacts
- Outlook Tip: Changing Fonts in HTML Stationery

3. New and Improved
- Restore Individual Mailboxes and Messages
- Tell Us About a Hot Product and Get a T-Shirt!


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Editor's note: Share Your Exchange Discoveries and Get $100
Share your Exchange Server and Outlook discoveries, comments, or problems and solutions for use in the Exchange & Outlook Administrator print newsletter's Reader to Reader column. Email your contributions (500 words or less) to [email protected] We edit submissions for style, grammar, and length. If we print your submission, you'll get $100.


==== 1. Commentary: SURBLs: The Upside of Sharing Spam ====
by Paul Robichaux, News Editor, [email protected]

Like spam itself, the market for spam-filtering solutions is constantly growing and changing. A few years ago, simple subject, sender, or IP address filters were sufficient to battle spam. But as the arms race between spammers and the rest of us continues to escalate, collaborative solutions are becoming the top choice for the front lines.

Collaborative solutions depend on the fact that spammers broadcast their messages out to the entire world. If you receive a spam message and share its identifying characteristics with others, they can preemptively filter the message based on your identification. With a sufficient number of reporting stations sharing this type of information, you wind up with good coverage and filtering shared across many mail servers.

One promising new approach is the use of Spam URL Realtime Block Lists (SURBL-- ). These lists work by collaboratively tracking URLs included in spam messages. Spam can come from a distressingly wide variety of sources, but to be effective it has to include some way for the recipient to contact the spammer. By flagging as spam messages that contain a particular URL, it's possible to catch spam with a high degree of accuracy. Of course, the SURBL approach isn't perfect: It won't help with spam that lists a phone number rather than a URL. Spammers might also be able to fool the lists by encoding URLs, although that trick will work only until someone reports the encoded version.

Exchange Server doesn't feature much built-in support for collaborative filtering solutions. However, the lack of direct Exchange support is actually a good thing because the field of available solutions is changing so rapidly that any built-in support might soon become outdated. For example, the one collaborative solution that Exchange does support out of the box is Real-time Block Lists (RBLs, aka DNS block lists), which have already lost some of their effectiveness as spammers move toward sending messages from individual "zombie" machines instead of from easily identified IP address ranges. And the market for antispam solutions is so competitive that new and improved third-party products are always readily available. SURBLs are relatively new, and (as far as I know) no Exchange-aware antispam solutions support them--yet. It's a safe bet that competitive vendors will add support soon, but in the meantime, check out the SURBL Web site ( ) to find out more about how the filtering technique works. As with other community or collaborative reporting systems, the more people who participate, the better the system works for everyone involved.


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==== 2. Resources ====

Featured Thread: Solution for Sharing Contacts
A forum reader needs help finding a way to let Outlook users share contacts and related information. To offer your help or read others' suggestions, go to the following URL:

Outlook Tip: Changing Fonts in HTML Stationery
by Sue Mosher, [email protected]

Q: How can I change some of the fonts in the third-party HTML stationery I use with Outlook?

A: Stationery is actually an HTML file that contains font information, background and other graphical elements, and layout components such as signatures. Microsoft Office installs stationery in the \Program Files\Microsoft Office\Stationery folder. You can create your own stationery or download it from many sources on the Internet.
You specify fonts in stationery by using the HTML style element, which tells the application rendering the HTML message (e.g., Outlook) which font to associate with the basic paragraph styles likely to appear in the message. If you use Notepad to open the notebook.htm file, you can view the HTML source code for Office Outlook 2003's Notebook stationery. You can see that all the styles listed--P.msoNormal, LI.msoNormal, and body--use a 12-point MS Sans Serif font. To change this font to 10-point Arial, replace MS Sans Serif with Arial, then replace 12pt with 10pt. Save your changes. To test the new version of the Notebook stationery, choose Actions, New Message Using, More Stationery, then select Notebook.
See the Windows & .NET Magazine Exchange & Outlook Web page for more great tips.

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==== 3. New and Improved ==== by Angie Brew, [email protected]

Restore Individual Mailboxes and Messages
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