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usereplyto)         
The usereplyto keyword controls the mapping of the 
Reply-to: header. The default is usereplyto 0, which means 
to use the channel default behavior (which varies from channel to 
channel).
| Value | Action | 
|---|---|
| -1 | Never map Reply-to: addresses to anything. | 
| 0 | Use the channel default mapping of Reply-to: addresses; (varies from channel to channel). This is the default. | 
| 1 | Map Reply-to: to From: if no usable From: address exists. | 
| 2 | If there is a usable Reply-to: address, then map it to From:; otherwise fall back to the From: address. | 
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