Asf specification microsoft

Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. The improved Microsoft Defender portal is now available. Learn what's new. ASF specifically targets these properties because they're commonly found in spam. Depending on the property, ASF detections will either mark the message as Spam or High confidence spam.

Enabling one or more of the ASF settings is an aggressive approach to spam filtering. You can't report messages that are filtered by ASF as false positives. You can identify messages that were filtered by ASF by:. For more information, see Configure anti-spam policies in EOP. Off : The ASF setting is disabled. This is the default value, and we recommend that you don't change it. Test : ASF adds the corresponding X-header field to the message.

What happens to the message is determined by the Test mode TestModeAction value:. The following Increase spam score ASF settings set the spam confidence level SCL of detected messages to 5 or 6, which corresponds to a Spam filter verdict and the corresponding action in anti-spam policies.

MarkAsSpamEmptyMessages Messages with no subject, no content in the message body, and no attachments are marked as high confidence spam. This tag allows the embedding of different kinds of documents in an HTML document for example, sounds, videos, or pictures.

These scripting languages are used in email messages to cause specific actions to automatically occur. This tag is used to create website forms. Email advertisements often include this tag to solicit information from the recipient. These tags are used in email messages to format the page for displaying text or graphics.

Messages that contain web bugs are marked as high confidence spam. Legitimate newsletters might use web bugs, although many consider this an invasion of privacy. This tag allows plug-ins or applications to run in an HTML window. Messages that contain words from the sensitive word list in the subject or message body are marked as high confidence spam. Test mode is not available for this setting.

This setting combines an SPF check with a Sender ID check to help protect against message headers that contain forged senders. For more information, see Backscatter messages and EOP. An ASF file is organized into sections called "objects.

The Header object contains general information about the file, such as file size, number of streams, error correction methods, and codecs used. Metadata is also stored here. The Header object is the only top level object that can contain other objects. The Data object contains the stream data, organized in packets. The index associated with each key frame can be a presentation time, a video frame number, or a reference time stamp.

Each top-level or lower-level object begins with a globally unique identifier GUID and a size value. These numbers allow the file reader to parse the information at appropriate places into identifiable objects.

Because of these GUIDs, lower-level objects can be sent in any order and still be recognized. The ASF format is designed to overcome inaccurate data reception. A partially downloaded ASF file can still be read, as long as it contains the Header object and at least one Data object.

You can download the specification from the Microsoft Web site. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.