
Change the email account on received email
After importing messages into Outlook, they may display the wrong email account. You can use a macro to change the account shown in the Email Account field.
Email address was spelled wrong, is delivered
When you use the Resend button in an NDR to resend a message, the incorrect email address may be visible on the received message.

Send email to all addresses for one Contact
How to send an email message to all addresses assigned to a Microsoft Outlook contact.

Changing the From Domain in Office 365
An Office 365 user was trying to make Outlook use his vanity domain as the From address instead of the Office 365 default domain (onmicrosoft.com). This is not something that is controlled from Outlook, its set on the server. While you can have multiple addresses assigned to your mailbox (and receive mail sent to those
Contacts with more than three email addresses?
Microsoft Outlook (every version) has just three address fields. Some users need more fields: Email addresses are used for more than sending emails. They are also used by the social connector to bring together all information about a contact. Why are contact's limited to 3 addresses? There should be room for an unlimited number of

Add Additional SMTP Addresses to a Mailbox
Add additional SMTP addresses to Exchange mailboxes, individually or using a recipients email address policy.

