Wx experiments (#186)

Webextension MVP Experiments

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+# Capabilities
+
+"Manage sieve" and "Sieve" are both open standard published by the RFC.
+
+## Manage Sieve
+
+Manage Sieve is a protocol for remotely managing sieve scripts on a server.
+
+The protocol itself is specified in:
+* [A Protocol for Remotely Managing Sieve Scripts (RFC 5804)](https://wiki.tools.ietf.org/html/rfc5804).
+
+Currently supported authentication mechanisms are:
+* SASL CRAM MD5
+* SASL Login
+* SASL Plain
+* [SASL SCRAM SHA1](https://tools.ietf.org/html/rfc5802)
+* [SASL SCRAM SHA256](https://tools.ietf.org/html/rfc7677)
+
+Other authentication mechanisms may be added by request.
+
+## Sieve
+
+Sieve is a filter language run directly on the mail server whenever an new message arrives.
+
+All implementations are required to support the basic command set as specified in:
+* [Sieve: An Email Filtering Language (RFC 5228)](https://tools.ietf.org/html/rfc5228)
+
+
+The server may provide additional language extensions to a client. Currently the following extensions are supported.
+
+* [Sieve Email Filtering: Body Extension](https://tools.ietf.org/rfc/rfc5173)
+* [Sieve Extension for Converting Messages before Delivery](https://tools.ietf.org/rfc/rfc6558.txt)
+* [Sieve Extension: Copying Without Side Effects](https://tools.ietf.org/rfc/rfc3894.txt)
+* [Sieve Email Filtering: Date and Index Extensions](https://tools.ietf.org/rfc/rfc5260.txt)
+* [Sieve Email Filtering: Detecting Duplicate Deliveries](https://tools.ietf.org/rfc/rfc7352.txt)
+* [Sieve Email Filtering: Editheader Extension](https://tools.ietf.org/rfc/rfc5293.txt)
+* [Sieve Email Filtering: Environment Extension](https://tools.ietf.org/rfc/rfc5183.txt)
+* [Sieve Email Filtering: Imap4flags Extension](https://tools.ietf.org/rfc/rfc5232.txt)
+* [Sieve Email Filtering: Include Extension](https://tools.ietf.org/rfc/rfc6609.txt)
+* [The Sieve Mail-Filtering Language -- Extensions for Checking Mailbox Status and Accessing Mailbox Metadata](https://tools.ietf.org/rfc/rfc5490.txt)
+* [Sieve Email Filtering: Extension for Notifications](https://tools.ietf.org/rfc/rfc5435.txt)
+* [Sieve Email Filtering: Regular Expression Extension](https://tools.ietf.org/id/draft-ietf-sieve-regex-01.txt)
+* [Sieve Email Filtering: Reject and Extended Reject Extensions](https://tools.ietf.org/rfc/rfc5429.txt)
+* [Sieve Email Filtering: Relational Extension](https://tools.ietf.org/rfc/rfc5231)
+* [Sieve Email Filtering: Spamtest and Virustest Extensions](https://tools.ietf.org/rfc/rfc5235.txt)
+* [Sieve Email Filtering: Regular Expression Extension](https://tools.ietf.org/id/draft-ietf-sieve-regex-01.txt)
+* [Sieve Email Filtering: Subaddress Extension](https://tools.ietf.org/rfc/rfc5233.txt)
+* [Sieve Email Filtering: Vacation Extension](https://tools.ietf.org/rfc/rfc5230.txt)
+* [Sieve Vacation Extension: "Seconds" Parameter](https://tools.ietf.org/rfc/rfc6131.txt)
+* [Sieve Email Filtering: Variables Extension](https://tools.ietf.org/rfc/rfc5229.txt)
+
+Keep in mind the server needs to support and actively advertise the extension via the capabilities before it can be used by the client.
+
+Most servers support only a tiny subset of the extensions above.
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