Support for Dynamic '+' Email Aliases in Office 365
I am familiar with using a plus sign following my email alias to create dynamic unique addresses for a Gmail account. e.g. firstname.lastname@example.org will arrive at my Gmail mailbox, where I can then apply rules based on the 'To:' address. See this page for details: https://support.google.com/mail/answer/22370
I tested this on my Office 365 address and it works, but only for email addresses in my parent domain. Using the aliases on subdomain addresses results in a 'recipient not found' NDR.
Does anyone out there have more information on this feature or if it even is one for 365 / Exchange?
I’m pleased to announce that the plus addressing feature is now available for Exchange Admins to enable. This can be done through Powershell using the following command:
Set-OrganizationConfig -AllowPlusAddressInRecipients $true
For instructions on how to use Powershell, you can find out more here:
The setting may not instantly take effect so please expect a delay before you can start using plus addresses.
The Exchange Transport team
(see new idea: " allow users to set plus addresses as a "from" address.")
Thank you for supporting plus addresses! Now, to round this feature out, we need to be able to (especially in dedicated mail apps) alter our "from" address to include the "plus section", so if I give out my address as email@example.com, then when I reply to an incoming mail (or send out an original email), it is seen to be as "from" name+box@, rather than just name@. Without this feature, plus addresses are easily contaminated.
Yes, I know that savvy people would be able to decode the basic address underlying a plus address, but most people will just pick out the from address in an existing email. (Yes, 'reply-to' can be customized, but that's not universally supported by recipients).
I would still be happy if for spoofing reasons the feature were limited to just plus addresses of the base email, though I realize there are other good reasons for customizing the "from" address.
Craig Reilly commented
1) What happens when an address already has a plus in it?
2) Of course, if you use an external spam filtering service, they need to support this - and allow the email to be scanned and continue its joourney.
We had a bug with using plus addresses for non-mailbox recipients. We therefore scoped the feature to mailboxes to start with. We are rolling out a change to expand functionality to Groups and DLs. It will take time to roll out to the entire service though so expect to start seeing support in late November or early December. Thanks for your feedback. We chose to release this feature in its current state to get it out as soon as possible to customers, many of whom only want it for use with mailboxes.
@Shahin: PowerShell is the only way to turn the feature on at this time.
Nicholas Fiorentini commented
Is not working with DL.
Shahin Pirooz commented
Is PowerShell the only way to turn the feature on?
I've created a new request asking Microsoft to add plus email addressing for distribution lists as well. If you want this feature, please add your votes to https://office365.uservoice.com/forums/273493-office-365-admin/suggestions/41711161-enable-dynamic-plus-email-addresses-for-distribu.
Alex Bahret commented
This doesn't make any sense at all. The feature used to work with DLs on launch day. I have proof of it in my Inbox. I just now got a call from another tech that says it no longer works, and sure enough, it doesn't.
Why in the world would Microsoft disable this feature for DLs when it used to work? What the heck is going on?
I don't understand why you'd call this done. It's a month later, there's still no documentation on this new parameter, and it only works for mailboxes. We really need this to work for distribution lists.
Roberto Franco commented
Please enable it also for distribution lists, groups, etc.
Roberto Franco commented
I enabled the plus addresses on our 365 tenant but:
- writing from gmail to a plus address works fine
- writing to the same plus address from another 365 tenant doesn't work. The message never arrives and the sender doesn't even receive any NDR message.
This only works internally. We have had this enabled on exchange for several weeks now. When I send email to a + address from an email that's on the same exchange server, all is fine. When I send to the dynamic work address with an external address (outlook.com or gmail.com for example) it comes back with an Undeliverable failure message. How can this be fixed?
This is working against individual mailboxes. But not it seems against Office 365 groups or distibution lists? What?
@Bill: Plus addresses are only used for receiving messages.
@Hunter: There should be nothing else for you to do.
@Dustin and @Robert: Documentation is in the process of being published/updated
@V: There are no plans at this point to allow plus addresses for Exchange Server. If traffic is routed through Exchange Online to the Exchange Server, plus addressing will be supported.
Is this one way only? I get permission denied when sending with a + address. Receiving works fine. Also, this hasn't been enabled for very long, perhaps I need to wait?
Hi @Sean S, We have enabled this in our Tenant yesterday, confirmed that the AllowPlusAddressinRecipients is set to true but our messages are coming back as " Unknown To address ". Is their anything else we need to do to get this feature working?
Will there be any new documentation posted about this feature?
Is in future plan to add AllowPlusAddressInRecipients in Exchange?
Thanks for getting this feature out. It will be a big help for us.
As a follow-up, please update the commandlet documentation with this new parameter.
Activated before lunch, works now in the afternoon! Thanks, on to better things (renaming the tenant would be nice...)
Kévin LE QUILLEC commented
Same here, activated several hours ago, and it doesn't seem to work