set_message_id

Sets encoded Message-ID of the associated message as a guint64 number, partial MD5 sum.

The value can be cast to SummaryMessageID.

This property is considered static, in a meaning that it should not change during the life-time of the this, the same as it doesn't change in the associated message.

If the this changed, the 'dirty' flag and the 'folder-flagged' flag are set automatically, unless the this is aborting notifications. There is not emitted folder's "changed" signal for this this.

Parameters:

this	a MessageInfo
message_id	a message id to set

Returns:

Whether the value changed.