You are allowed to define simple transformation rules which will be applied to all email being forward by sendmail. Mostly, you specify a from and how this from should be translated.
You have some flexibility here. You can translate from
Here is a presentation of the different field of a rule's dialog.
You are allowed to activate/deactivate a rule without erasing it using this checkbox.
You must enter an email address. Optionnally, you may omit the user name and only supply the domain name prefixed with the '@' character. This means that the rule apply to any user of the domain.
The "from" email address will be rewritten using this field. You must specify again an email address. Again, you may omit the user name and just provide the domain name prefixed with the '@' character.
Enter whatever you want to remind you of the reason why you have use this feature (masquerading rule). Normally masquerading rules are used last. It is better to fix the problem at the origin. Unfortunatly, this is not always possible, for all kind of very good (and stupid) reasons.
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