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?
Do you know what makes this issue worse. Dynamic "+" addresses work on free Hotmail/Outlook addresses!
Reported March 2017, no response as of July 2018? Nice. But I suppose it should be no surprise that Microsoft wouldn't follow the RFC's, nor listen to their users.
I used to use this feature every day on G Suite and it looks like there's no chance of O365 getting this fairly basic functionality.
This is preventing us from moving from gmail to office365 for email.
My company's dev team could really use such a feature for testing our web application!
we need this for dev testing!!!
Scott Francis commented
it's not just a genius idea, it's a REQUIREMENT from the relevant RFCs (822, 2822, etc.)
Not supporting "+" in the user-part means an email handling software is in violation of the RFCs that specify the standards that must be adhered to.
[Deleted User] commented
i am sorry but i does not work on Office 365 Business Premium accounts; even with the rule in the mail flow section. maybe I did something wrong.
This workaround doesn't work in my environment. Throws the error:
550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup
I suppose it's checking the address existence before checking the mail flow role.
Be able to receive emails to: "FirstPartOfYourMail+ANYTEXT@YourDomain"
Here is how:
- Got to Exchange admin portal
- Go to MailFlow
- Create a rule
With the following settings:
- Apply this rule:
- "When recipient matches: "FirstPartOfYourMail+" <- please note the plus in the end
- and :A recipients domain is "YourDomain"
- Do the following
- redirect messages to "ChooseYourExchangeMailbox" <= you will be able to select them from a list
DO the following
This will only ALLOW YOU TO receive Emails for disposable addresses though while google enabled you to also SEND emails from these addresses as they became a dynamic alias.
That our MAIN concern was to loose emails as we were not able to receive emails from previously setup accounts anymore and it was impossible to run them all down. I hope somebody else that runs into this issue dosen't have to spend weeks to figure this out when the fix is relatively simple.
Should somebody need to send from these emails you will have to add them one by one (this could also be scripted):
- Add Alias for specific email that user wants to send with
- Since the alias contains a "+" we CANNOT use the office admin portal as this wont let us enter "+" as alias, but we HAVE TO to use the Exchange admin portal
- In Exchange admin portal go to Recipients
- Double click on user you wanne add an alias for
- go to email adress tab on user
- now add the new alias (this interface allows us to enter a "+")
- make sure you save after
The E-mail standard says that comments can be included by surrounding them in () at the beginning or end of the local part. Example:
- or -
Has anyone tried this with 365?
We have systems sending out automated emails. The only people not getting them are those with Office 365 eMail addresses.
also waiting for this to be added. +1000000000
Lucas Wood commented
Me and all my email aliases vote for this.
Josh Davidson commented
As a developer we made heavy use of this feature in GSuite before moving over to O365. It allowed us to create disposable accounts for testing purposes. We're kind of stuck now with creating a bunch of manual of aliases.
This is the SINGLE remaining reason for us not to be able to migrate to O365.
Amy updates on this? I kind of need this feature before I move over to office365.
This is really good feature & kind of self service. It doesn't need any action from Office 365 admins. Users should be able to add any alias with their email id and mail should be received at their primary SMTP address.
Looking forward for positive response.
This is a genius idea, Gmail & other already use this.
Please Microsoft, we need this too! Too much leaks of our e-mail addresses from our suppliers, we could trace them that way...
See also :
These are called disposable email alias or addresses.