lookup> message/vnd.si.simp

message/vnd.si.simp

message/vnd.si.simp is a message media type.

messageContent-Type

Quick facts

MIME typemessage/vnd.si.simp

Extensions—

Charset—

Compressible—

Sourceapache

What is message/vnd.si.simp

message/vnd.si.simp

message/vnd.si.simp is one of the message media types used on the internet. When serving this content over HTTP, set the Content-Type header in the response, for example:

Content-Type: message/vnd.si.simp

Relation chain

…served as

mime type

message/vnd.si.simpsent via header

http header

Content-Type

Related MIME types

message/bhttp message/cpim message/delivery-status message/disposition-notification

.disposition-notification

Used with

message/vnd.si.simp is identified in HTTP by the Content-Type header and is commonly used with these methods:

Related headers

Related methods

Frequently asked questions

What is message/vnd.si.simp?

message/vnd.si.simp is a message media type used to identify a content format; servers announce it to clients with the Content-Type header.

Which file extensions use message/vnd.si.simp?

Extensions such as none registered are associated with this MIME type.

How do I set the Content-Type for message/vnd.si.simp?

Send Content-Type: message/vnd.si.simp in the HTTP response.

Sources & standards

Updated 2026-08-18

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