Mail app won’t update to new email

Setting the Default Account in iOS Mail chooses the email account, whereas setting the Primary Alias in Microsoft determines the preferred Outlook sender address. These are two different settings.

iOS Mail app may not allow this, however you may attempt as per the steps given below.

If your existing Outlook account is already configured in iOS Mail:

• You do not need to add the new alias separately.
• Your new alias belongs to the same Microsoft account.
• You can use the existing account to receive messages sent to either alias.
• To send emails from the new alias, you may need to configure the From address in Outlook.com or the Outlook app.

My recommendation: If you want the new alias to be your principal email address for sending and receiving emails, first make it the primary alias in your Microsoft account, then check the default sender address in Apple Mail.

Ensure your new alias is the default sender

Since you have already made the new alias your primary Microsoft account alias:

• Microsoft uses the primary alias as the default From address for Outlook.com.
• Apple Mail may use the sender address supplied by the Microsoft account when composing messages.
• iOS Mail does not provide a separate permanent default-alias selector for an Outlook account.

Verify the sender address

1. Open the Apple Mail app.
2. Tap the Compose icon.
3. Tap the Cc/Bcc field.
4. Tap the From field.
5. Check which email address is displayed.

If your new alias is displayed, you're all set.

If your old address is displayed and the new alias is not selectable, try composing a message using outlook.com --> Read this Send email from a different address in Outlook.com

To test my theory that the iOS Mail app does not support sending emails using an Outlook.com alias address, I created a new alias email address and successfully added it to the iOS Mail app.

Although I can receive emails sent to the alias without any issues, when I attempt to compose a new email, the iOS Mail app only allows me to select the primary Hotmail.com email address as the sender. The newly created alias address does not appear as an available option in the From field.

Based on my testing, it appears that the iOS Mail app recognises the alias for receiving emails but does not allow me to use it as the sender when composing or replying to emails.

Step 1: Create Alias Account (Pic 1)

Step 2: Add to iOS Mail account and send an email (Pic 2)

Pic 1

Pic 2

For Microsoft 365 Business Accounts

Sending from aliases may require the organisation to have Send From Alias enabled by the administrator. Receiving mail to an alias works automatically, but sending from it can depend on tenant configuration.

Change your default From address

To change your default From address, you will need to update your primary alias. For more information, please go to Add or remove an email alias in Outlook.com.

Tap on Edit Account Info: Make your alias address a Primary Account as shown below

1. Is this your corporate/organisation/enterprise/School Management iPhone? Then please contact the system administrator of your corporate//organisation/enterprise/School Management
2. If it is your device, in that case, do you have any profile installed by your corporate/organisation/enterprise/School Management?
   1. Erase the profile added by you If you have installed a profile on your own --> Install or remove configuration profiles on iPhone - Apple ...
   2. Or please contact the system administrator of the organisation who provided the profile to you

A corporate profile installed on your iPhone could potentially be contributing to the inaccessibility of certain features. 

Here's why:

• Restrictions: Corporate profiles can have restrictions placed on apps and functionalities. These restrictions might be limiting some activity, causing it to be unresponsive or quit.
• Managed Apps: IT departments might deploy specific navigation apps through the profile, potentially blocking certain functions or features.
• Security Settings: Corporate profiles often have stricter security settings that could affect app or function behavior. This might be causing unexpected behavior of an App or functions.

Here's what you can do:

• Check with IT: The best course of action is to contact your IT department. They can explain the restrictions set by the corporate profile and see what is affected. They might be able to adjust settings or suggest alternative apps or features approved for corporate use.
• Look for App Conflicts: See if your IT department uses a different app through the corporate profile. Conflicting apps might cause crashes.

Additional points to consider:

• Even if the profile isn't directly affecting the function, it's still a good idea to check with IT. They might be aware of similar issues and have workarounds.
• While troubleshooting, make sure you prioritize safety. Don't fiddle with your phone. 

By working with IT and considering these possibilities, you can hopefully identify if the corporate profile is the culprit and find a solution that allows you to use the iPhone to your liking.

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