Outlook 2013 / 2010 does not honor default account while send emails.

Problem:


Outlook 2013 / 2010 does not honor default account while send emails.

Solution:

When you have multiple accounts and an IMAP account in Outlook 2010/2013 and you change the default sending account to the IMAP account, you may experience the following issues:
When you click a mailto link from a browser or from Outlook, the default sending account is the Exchange Server account instead of the IMAP account.
When you create a new email message, the Exchange Server account is selected instead of the IMAP account.

Out of the box, Outlook 2010 SP1 and Outlook 2013 use the default account for Send to commands but not for new messages created while viewing a pst file (when a POP account is assigned to the pst file), unless you set a registry value to always force the use of the default account.

To force all new messages to use the default email account, regardless of which pst file you are viewing, browse to the following registry subkey.

In Outlook 2010 and add a DWORD named NewItemsUseDefaultSendingAccount:
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Options\Mail
DWORD value: NewItemsUseDefaultSendingAccount
Value: 1


In Outlook 2013, the key is:
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Options\Mail
DWORD value: NewItemsUseDefaultSendingAccount
Value: 1


Note: To open Registry Windows Press Window key+R and type--Regedit and press enter.