From: header being changed in Mail 2.1

My Mac is on a small LAN I set up in my house to enable multiple Net access with only one phone line.  To send mail I have to use the SMTP server that goes with the other computer on the network, though incoming mail comes to me via a quite different server and ISP.
Until two days ago everything worked fine, but starting yesterday my outging mail started showing, not my account information, but that of the other account holder, information which is included in the outgoing server settings.  This has become an issue for two reasons: some of my correspondants, for whatever reason, reply to the From: address rather than the Reply-to: address. And when sending to certain mailing lists my messages will be rejected because the list doesn't recognise the From: address.
Does anyone know why this would suddenly change? And how would I go about changing it back?

Problem solved. I couldn't fix the problem directly, but I was able to access my 'other' ISP's outgoing mail server (this wasn't possible a few years ago, which is why I never thought of it) and after restarting Mail and creating/erasing a duplicate account it seems to work fine. For some reason Mail seems a bit slow on the uptake when it comes to changing account information...

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    Check you accounts in Mail and make sure each account has the correct outgoing server address. Check the box to use only that server.
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  • From field being changed - How?

    This is probably going to be a rather dumb question, but here it goes. My company's CEO received a SPAM message the other day. The concern he had was that the message was not only addressed from him, but it appeared as though the sender was him also.
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    Recipient(s): [email protected]
    Subject: Your Featured Products of the Week?
    Message-ID Header: 20090318140646.3977.qmail@OMAR1
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    We are using Lotus Notes (Domino) for mail. They are only accepting messages from our Ironport devices.

    It's because the envelope sender doesn't necessarily have to be the same as the header('From') email address. For legitimate mail, this doesn't come up, but spammers use this to try and bypass spam filters and such.
    For example, here is what a potential smtp conversation between the Internet and the Ironport appliance:
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    This is probably going to be a rather dumb question, but here it goes. My company's CEO received a SPAM message the other day. The concern he had was that the message was not only addressed from him, but it appeared as though the sender was him also.
    I was able to find the message through Ironport Mailflow and saw that the message came into the Ironport device with a from field of ;
    Sender: [email protected]
    Recipient(s): [email protected]
    Subject: Your Featured Products of the Week?
    Message-ID Header: 20090318140646.3977.qmail@OMAR1
    So how does a Spammer get the message to change the sender field information to reflect the same as the To field?
    We are using Lotus Notes (Domino) for mail. They are only accepting messages from our Ironport devices.

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  • How to view "From" header field in OUTgoing messages in Mail? Frustrating.

    In Mail v.4.3 (in OSX 10.6.4), I need to view the "From" field in my outgoing messages as I am composing them. However, there seems to be no setting in Mail which allow this.
    I find this very frustrating because in Eudora (which I used to use), the "From" field in outgoing messages is visible by default. But in Mail, not only is it not visible by default, there seems to be no way to make it visible.
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    Thanks for replying.
    What is the "compose window" to which you are both referring? I could find no reference to such a thing in the Mail menus or Help.
    Do you mean the "Composing" pane in the Preferences? I don't see what either one of you is referring to there, but I did notice there something that could function as an awkward workaround: If I click on the "Automatically CC myself" box in Preferences>Composing, then when I start a new email, my email address is displayed in the "CC" field -- and luckily, Mail allows me to then delete my email address out of the CC field, so I don't have to spam myself with duplicate copies of all my emails. This way, I can at least briefly see what email address I'm using, before I delete it from the CC field. Pretty awkward and unnecessarily laborious, however -- still not a perfect solution.
    Or, by "composing window," are you referring to an outgoing email? As I said in my original comment, I do see what Ernie called "a small box with lines and an arrow at the bottom left of the header box." This is what I had to say about it:
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