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This is configured in the proxy settings. Mail From and Rcpt To is where you configure it. <br />
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<a href="https://filedb.experts-exchange.com/incoming/2017/11_w47/1212024/SMTPProx.png" target="_blank" title="SMTPProx.png (61 KB)"><img alt="SMTPProx.png" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2017/11_w47/800_1212024/SMTPProx.png" /></a>
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SMTPProx.png

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Thanks - I know WHERE to set up the rewrite... just could not get a valid replacement string. &nbsp;For instance, if I use *@contoso.com in the Pattern Match (or Regular Expression) and the incoming address is user@contoso.com, I could not find a replacement string that would give me user@contoso.org. &nbsp;I tried the typical regular expression field information (like $` , etc.) to get the string preceding the @contoso.com but it appears the replacement field only allows literal characters.
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Thanks Jeremy - didn't think to try the group id replacement option. &nbsp;Your solution is perfect!
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In WatchGuard XTM SMTP Proxy definitions, it implies you can set up a rule for &quot;masquerading&quot;. &nbsp;However, how do you set up the replacement string? &nbsp; For instance, if I want person@contoso.com to be redirected to person@contoso.org, it is easy enough to match the string and replace it. &nbsp;But, if I want everyone @contoso.com to be redirected to their same name @contoso.org, how do you set up the replacement string? &nbsp;You can use a wildcard on the string match but what syntax do they use for the replacement string to attach the portion before @contoso.com. &nbsp; Seems that this should be a simple process for creating masquerading.
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In WatchGuard XTM SMTP Proxy definitions, it implies you can set up a rule for "masquerading".  However, how do you set up the replacement string?   For instance, if I want person@contoso.com to be redirected to person@contoso.org, it is easy enough to match the string and replace it.  But, if I want everyone @contoso.com to be redirected to their same name @contoso.org, how do you set up the replacement string?  You can use a wildcard on the string match but what syntax do they use for the replacement string to attach the portion before @contoso.com.   Seems that this should be a simple process for creating masquerading.

Watchguard SMTP Masquerading

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