Thought 1: The setting you refer will not affect a message that you are already working on. It becomes effective in the next message editor window that is opened.
Thought 2: The setting is identity specific
<p>Thought 1:&nbsp; The setting you refer will not affect a message that you are already working on.&nbsp; It becomes effective in the next message editor window that is opened.&nbsp; </p><p>Thought 2:&nbsp; The setting is identity specific
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