Is it possible to host users within the same email domain within Office 365 and to host a few remaining users within a Gmail corporate account?

Users within both Office 365 and Gmail will both use the same email domain name which is company.com.

A company I am working for would like this to be done since they don't want to have to pay for an Office 365 licensing fee for all users and would like only the employees to be migrated into Office 365. They would like the contractors and consultants to be left within Gmail.

If this is possible what is involved in setting up this type of coexistence?

I have a site that has SBS2011 (which has Exchange 2010).  Approx 2 weeks ago the server stopped being able to send any email addressed as Gmail, hotmail and outlook.com.

When I run ExRCA it seems that when the server does the MX lookup it succeeds, but then does something wierd for the SPF lookup.  It appears to look for its own spf record, and instaed persuses the spf for the Outlook.com reporting that "Sender ID validation failed".  Am I reading the Exrca results wrong?

=====================================
 Performing Outbound SMTP Test
  The outbound SMTP test failed.
 
 Additional Details
 
Elapsed Time: 33947 ms.  
 
 Test Steps
 Attempting reverse DNS lookup for IP address nnn.nnn.nnn.nnn.
   The Microsoft Connectivity Analyzer successfully resolved IP address nnn.nnn.nnn.nnn via reverse DNS lookup.
     Additional Details
  The Microsoft Connectivity Analyzer resolved IP address nnn.nnn.nnn.nnn to host mail.acme.org.au.
Elapsed Time: 11276 ms.  

Performing Real-Time Black Hole List (RBL) Test
  Your IP address wasn't found on any of the block lists selected.
 Additional Details
Elapsed Time: 22361 ms.  
 Test Steps
 
 Checking Block List "SpamHaus Block List (SBL)"
  The address isn't on the block list.
 Additional Details
IP address nnn.nnn.nnn.nnn wasn't found on RBL.
Elapsed Time: 33 ms.  

 Checking Block List "SpamHaus Exploits Block List (XBL)"
  The address isn't on the block list.
 Additional …

We have an Exchange 2010 environment with several mailbox servers a single DAG and one CAS/OWA server. (we are unable to upgrade the version yet due to compatibility issues but we are working on it)

There were some issues when we were originally transitioning from 2003 so the Exchange admin at that time never implemented a CAS array.  

As part of our Disaster Recovery plan I would like to set up a second CAS server in our DR/colo site and have mail automatically flow through it should my primary site go down.  Of course mail has to keep flowing while I set up the new server and move over to the new array.

My question is is it possible to set up a new CAS server, create an array and move over to it without causing an interruption in mail?  Would my users continue to get mail from the stand-alone CAS server while I am transitioning them to the array?  what would be the order of steps to implement this change?  

As an added complication we are using VERITAS Enterprise Vault to archive our mail so we need to maintain Enterprise Vault integration in OWA.  But this is not a part of my original question.

Thank you.

In my Exchange environment, I have a public-facing Spamtitan server doing receiving/sending and spam-filtering, etc. Behind it is the Exchange 2007 with Hub Transport, Client Access and Mailbox roles. The other public-facing server is the OWA server with Client Access role.  

I need help with setting up an IMAP client.
First of all, in my environment as above, what should the incoming/outgoing email servers be?
Secondly, in Binding tab, it is port 143 for TLS and port 993 for SSL.
in Authentication tab, 'Secure logon' is checked while the X.509 certificate name is the OWA server name.

Can you help please?

Dear Experts, as my understanding, Exchange DAG (for 2 nodes) is the cluster that replicate all data from Mail Server1 to Mail Server2. Is it still correct in SAN storage environment? If so, everything related to mail in SAN storage will be duplicated, am I right? Can we configure so that there is only one version of data exists on it and there are only 2 VM servers for HA-failover?

Many thanks as always!

Hi Can

I install on the same Domain Controller environment a second Exchange Server?

They will be different version example one will be 2007 and the other 2016 - Reson not to all the step from migrating from 2007 to 2016 and I just export and import the PST from one server to the other. Also considering creating another domain on the same network just for mail.

Can I have some suggestions, please ?

Regards

Anthony

Hi,

outlook email alerts not coming. How keep alerts so that when email comes popup comes and also preferably some sound comes?
please advise

I have Exchange 2010 email account that is being forwarded to a distribution group that contains multiple recipients. I want to prevent the recipients from being able to reply to the original email sender. Is there  a way to do this through Exchange?

Dear Experts, we are deploying Exchange Server 2016-Enterprise for our company, but I only found the link for Standard version. I need to create more than 10 Mailbox Databases before I got the proper license of Enterprise version. Is it possible? If so, can anyone explain please?

After reboot, I got this error in Exchange Management Console, also I could not login to OWA, it showed blank page when I entered correct username/password.

All Exchange services are running. Environment: Exchange 2016, Window Server 2012R2

Can anyone help, please?
err2.PNG
err.PNG

Hi,

I have a user with iPhone 5E and iOS version 10.2.1.

I am trying to add an email (Exchange 2007) to her iphone but it keeps showing certificate not trusted. I have tested the same email account on another iphone with same iOS version but different model and it works okay. I have deleted the account and re-added it but no success.

When adding an account on her phone, it says "cannot verify server identity" but error is caused by the certificate not trusted error.

Please see the attached. There isn't even a menu Trust at the top.
IMG_7025.png