In this post I explain how you can enable sending mails with a mail alias in Microsoft 365 Exchange Online. This capabiltiy is very long awaited by many. When migrating from Exchange Server to Exchange Online many need to cope with the limitation that is was not yet possible to just send mails with a mail alias, proxy address or further mail address which is connected to a Microsoft 365 user account.

Till today you were able to only receive mails on your mail alias on Exchange Online. But now, you can configure your Exchange Online organization to send mails with aliases or proxy addresses, finally. All Microsoft 365 admins and consultants working with Exchange Online seem to go out and spread the word. 🙂 This is important because this feature is not on by default. That’s why you need to know so that you can enable it if your users and you want to have it. Thanks to Greig Sheridan, LazyAdmin blog and Expta blog for sharing this.

Source: https://pixabay.com/illustrations/email-newsletter-marketing-online-3249062/

Enable Exchange Online to send with alias address

#Install EXO module
Install-Module ExchangeOnlineManagement
#Maybe restart your shell

#Import module
Import-Module ExchangeOnlineManagement

#Connect EXO
Connect-ExchangeOnline

#Get as-is EXO org config
Get-OrganizationConfig | fl Name, SendFromAliasEnabled

#Set 
Set-OrganizationConfig -SendFromAliasEnabled $true

#Get as-is EXO org config (validate)
Get-OrganizationConfig | fl Name, SendFromAliasEnabled

#Disconnect EXO
Disconnect-ExchangeOnline

Example

Screenshot Example

In my test the feature showed up a few minutes after enabling it.

User experience – Send with an alias (using Outlook on the web)

The following screenshots depict the look and feel for users. The example shows Outlook on the web, it works also with other Outlook apps.

Screenshot UX send mail with alias in Outlook on the web | open … menu
Screenshot UX send mail with alias in Outlook on the web | Enable “Show From”
Screenshot UX send mail with alias in Outlook on the web | Enter your mail alias address in the From field

Conclusion, opinion and summary

I’m glad that we can now send mails out with a mail alias address. Enjoy and let others know about small but extremly helpful Exchange Online mail feature.

Additional resources