: Increase Identity signature size limit (htmlSignature/textSignature)

Which feature or improvement would you like to request?

The current JMAP Identity signature fields (htmlSignature and textSignature) have a hard limit of 2048 characters, which is too restrictive for modern email signatures.

Many business email signatures include: Company logos (as base64 inline images) Rich HTML formatting Contact information with social media icons

A typical signature with a small logo easily exceeds 2048 characters due to base64 encoding. Requested change: Increase the limit to at least 100KB (102400 characters) for htmlSignature ?

Is your feature request related to a problem?

When trying to update an Identity with an HTML signature containing an inline image (base64 encoded logo), the JMAP server returns: {"methodResponses":[["Identity/set",{"accountId":"h","notUpdated":{"XX":{"type":"invalidProperties","description":"Field could not be set.","properties":["htmlSignature"]}}},"XX"]],"sessionState":"XX"}

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