Solved

Alias from other domain to O365 - 1 user out of a few?  MX record question

Posted on 2015-01-15
9
177 Views
Last Modified: 2015-01-16
We got an Exchange Online plan and have another domain we want the user to be able to receive e-mail from and send e-mail as.

So Sally@Domain.onmicrosoft.com wants to receive e-mail from account Sally@anotherhost.com and be able to SendAs that address.

Problem is, there are other users over at "anotherhost.com" who don't need to move over to O365, so I'm not sure if changing the MX records can be done for just 1 user, or if we do anything with the MX records, if the O365 user will continue receiving e-mail and the other users at anotherhost.com will no longer receive e-mail at their current host inbox.
Or will the other users still be able to send/receive their e-mail unaffected?
0
Comment
Question by:garryshape
  • 5
  • 4
9 Comments
 
LVL 38

Accepted Solution

by:
Vasil Michev (MVP) earned 500 total points
Comment Utility
You can configure forwarding from that other system to her @onmicrosoft.com address. As for sending, you can verify the domain with office 365 and use one of the available methods for sending as alias (only the primary alias can be used for sending by default). You don't need to change the MX record in order to be able to send mails, but you will need to adjust the SPF record for that domain to include both the Office 365 server and the other host servers.
0
 

Author Comment

by:garryshape
Comment Utility
Ok so for the alias part, how do you do the SPF record? Do you have to confirm something on both sides of the domain?
0
 
LVL 38

Assisted Solution

by:Vasil Michev (MVP)
Vasil Michev (MVP) earned 500 total points
Comment Utility
No, you need to adjust the SPF record for your domain to include the Exchange Online servers, otherwise the messages sent from there will be marked as spam. It might not be possible though, depending on what the record currently looks like (EO has too many servers and including them all leaves a little room for your existing mail system).

Probably it will be easier if you just verify a subdomain, such as info.anotherhost.com, for which you can then configure both the MX and SPF records without affecting anything on the other side. If Sally is OK with that of course :)
0
 

Author Comment

by:garryshape
Comment Utility
Hmm so you're saying if I made a sub-domain like "info.anotherhost.com", then she could use Sally@info.anotherhost.com, or would she be able to actually use use Sally@anotherhost.com as her From address?
0
Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 
LVL 38

Assisted Solution

by:Vasil Michev (MVP)
Vasil Michev (MVP) earned 500 total points
Comment Utility
It will be Sally@info.anotherhost.com, so not exactly what was first intended. But it will be easier to set up, as you can make the alias primary and mail send to her will flow directly in O365 (no need for forwarding). And it will not affect the other mail system in any way.
0
 

Author Comment

by:garryshape
Comment Utility
ok so could I do this then

Add the Exchange Online TXT record to Homestead hosting.

Then after that, add the domain over to Exchange Online.

That means users who have email hosted on Homestead will still receive their e-mail on Homestead, but if they happen to also have another email host at Exchange Online, then they can change their "From" address to their Homestead-hosted e-mail address...?
0
 

Author Comment

by:garryshape
Comment Utility
ok I added the txt record on Homestead's side, and then O365 let me use that domain address as the "From" address with no permission errors.
Now I'm just testing to verify that the TXT record hasn't changed the e-mail routing/delivery to go to O365 instead of Homestead's inbox (where we do want it to go still).
0
 
LVL 38

Assisted Solution

by:Vasil Michev (MVP)
Vasil Michev (MVP) earned 500 total points
Comment Utility
As long as you dont change any other DNS record, nothing will be affected. Adding the domain to O365 will allow them to send as such alias, but will not be able to receive. And, as mentioned above, your messages sent form O365 might be flagged as spam, unless you modify the SPF record.
0
 

Author Comment

by:garryshape
Comment Utility
Ok cool well it appears to work, and I may need to dig into Powershell to do the SPF record, I'm not sure, but that definitely helps put me in the right direction on that front.
As for the alias, it does work, I sent to gmail, so thanks so much. And we will probably just set forwarding on the home-stead mailbox to the O365 one.

I wonder if e-mail forwarding will forward Calendar appointments properly
0

Featured Post

Why spend so long doing email signature updates?

Do you spend loads of your time carrying out email signature updates? Not very interesting are they? Don’t let signature updates get you down. Let Exclaimer Cloud - Signatures for Office 365 make managing email signatures a breeze.

Join & Write a Comment

Companies keep a much closer eye on costs today, so changing to new Technology – Microsoft Office 365 is the smartest move to take.
Marketers need statistics and metrics like everybody else needs oxygen. In this article we explain how to enable marketing campaign statistics for Microsoft Exchange mail.
This Experts Exchange lesson shows how to use VBA to loop through rows in Excel.  In order to sort, filter, and use database features, there needs to be a value in each column for every row. When data arrives with values missing, code to copy values…
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now