How to automatically add signature to specific email accounts Outlook 2010
Solution 1:
Insert a signature automatically
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On the Message tab, in the Include group, click Signature, and then click Signatures.
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Under Choose default signature, in the E-mail account list, click an email account with which you want to associate the signature.
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In the New messages list, select the signature that you want to include.
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If you want a signature to be included when you reply to or forward messages, in the Replies/forwards list, select the signature. Otherwise, click (none).
Insert a signature manually
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In a new message, on the Message tab, in the Include group, click Signature, and then click the signature that you want.
Source
Edit: Provided you have assigned a signature to the currently selected account, Outlook 2010 will change the signature when you select a different account from the Account dropdown. So make sure each account has a default signature set for this to work, even if the signature is blank.
Solution 2:
2 years later I was faced with the same issue. The solution is to add the second mailbox as an "E-mail Account" and not as an "Additional Mailbox" of the default mailbox. Seems that it would work either way but it doesn't.
Solution 3:
For automatically setting up your signatures to all your mail replies and forwards:
- Go to new message tab and select signature --> signatures
- Choose the E-mail account
- Select the signature name you want to add for new messages
- Select the signature name you want to add for replies/forwards
Note: the default setting would be as (none) that is the reason why the signature was not showing up in your mails.
Hope this helps Outlook 2010 users.