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When I reply to a mail message, the reply is sent using the default email address as defined in, and not the email address that it was originally addressed to.

I have all accounts correctly set up and active.

To make it use the correct address, I need to manually select the account I want to send the email through. I am using OS 10.8 recently updated it. It did not happen with previous OS.

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This may be because a certain account is locked into a particular SMTP server.

  1. Open Mail Preferences by typing Command + , or Mail -> Preferences
  2. Click the Accounts tab.
  3. Click on an account and make sure "Account Information" is selected.
  4. In the "Outgoing Mail Server" section, make sure the "Use only this server" is not checked.
  5. Do this for every account.
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Unfortunately does not work. Tried this... and same result... – user41795 Feb 13 '13 at 18:17

After extensive reading at the Apple discussion forums, my feeling is that this is a BUG in v6.2 (OS X 10.8.2):

In 10.6 & and 10.7 versions of Mail, when you hit "reply," it automatically chose the correct From: address, based on the To: field of the message you were replying to.

In 10.8, for messages that have been processed by rules (i.e. filtered automatically into local folders) this functionality is apparently broken.

See these very informative, exhaustive discussions:

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