>I would like to know if there is a way in Mail Daemon to adjust the From email when sending to a specific domain. For example, my email is mfournier@levelextreme.com. Whenever I send an email to a specific domain, I would need the email to be adjusted to mfournier@TheCompanyHere.com. TheCompanyHere is the place where I would need the email to be adjusted. This is because all emails sent to a specific location need to be received as if I would have sent it from the email account I have there.
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>I know this can be adjusted in Outlook. But, I need to avoid that and let the control at the mail server directly so I wouldn't have to worry about it.

I don't know what product you mean by "Mail Daemon". That is a generic term used for mail servers on *n?x systems. I didn't find any specific product with that name with a quick Google search. So, I don't have an answer for your specific question.

However, there is at least one (potential) issue with what you're trying to do. By default, any spam filter that uses reverse DNS lookup will reject mails sent as @TheCompanyHere.com if reverse DNS shows they're actually coming from @levelextreme.com. To prevent that, you will need to get the network admin @TheCompanyHere.com to add a DNS SPF record for their domain, that lists your mail server's IP as one of the IPs that may be sending mail from their domain.

A general word to lurkers: these days, if you're trying to do anything tricky with e-mail it pays to know all the implications of what you're about to do, and set things up right the first time, and ahead of time. We can use your specific case as an example of what can happen:

1. Suppose you do not get @TheCompanyHere.com to set up a DNS SPF record for you. Spam filters that use reverse DNS lookup will reject mails supposedly from that domain but sent from @levelextreme.com.

2. Most spam filters subscribe to e-mail blacklists, and feed back information about mail they've rejected to those blacklists.

3. If a blacklist gets enough negative feedback, it will blacklist you. Critical note: what gets blacklisted is your mail server's IP address, not just sending from your IP as @TheCompanyHere.com.

4. Result: you find sending mail from @levelextreme.com or any other domain you have legitimately and correctly set up on that IP address no longer works properly - many recipients will no longer get your mails because spam filters that subscribe to that blacklist automatically reject any mails from your IP.

5. If you don't deal with the problem correctly and immediately, it avalanches - more and more blacklists pick up your blacklisted status and add your IP

There is a useful blacklist check tool at http://mxtoolbox.com/blacklists.aspx .