Emails going to proxy addresses

Question

When one of our team members on the Outlook application would email a person.

They have a guest account on the tenant with two email addresses or proxy address

SMTP: ******@sms.domain.com

smtp: ******@freedomains.com

The email does not reach the smtp address, it gets changed to the SMTP address.

Is it possible to turn off the feature? It suddenly started to do this on our tenant when everything was working perfectly before.

Answer 1

Hi @Michael Jaszczur,

As this is the expected behavior that emails sent to proxy addresses will be delivered to the primary email address,

if the purpose is to have emails be delivered to both email addresses of this guest user, to me we may need to remove the additional email address from this guest user.

You can remove the additional ******@freedomains.com email address from this guest via Exchange Online Powershell.

The general steps are:

1.connect to Exchange Online Powershell with an account which has Exchange admin permission

2.run the following cmdlet to check the current email addresses of this guest

Get-mailuser guest | fl Displayname,PrimarySmtpAddress,EmailAddresses

3.run the following cmdlet to remove the proxy address from this guest

Set-Mailuser guest -EmailAddresses @{Remove="smtp:******@freedomains.com"}

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