Add Non-Google Email Services (Hosts)
Add another mail service to your Google Workspace settings.
To set up SMTP relay, have your non-Gmail service connect to:
Next, add your network IP to the SMTP relay service in the Admin console:
In the Admin console at https://admin.google.com, click the Apps icon.
Select Google Workspace.
Click Gmail. Make sure not to check the box to the left; just click the service.
Select Routing.
Under Organizational Units, select the OU with the users whose settings you want to update. The same updates will apply to all sub-OUs under the OU you choose.
By default, if you don’t select an OU, you will add your setting to the top OU, named after your domain. This way, you will apply changes to all users in your account. This is generally recommended in this case.
To the right of the SMTP relay service setting, click CONFIGURE.
On top, type a description for the email rule. In this case, we named it ‘Routing outbound mail from another server through Google.’
Then choose the allowed senders under 1. Allowed senders.
Next, if you wish, you can specify which IP addresses to accept mail from under 2. Authentication and Google will reject mail coming from any other IP.
Check Only accept mail from the specified IP addresses, then click ADD to add an IP range.
Type a description and the IP address or range, then click SAVE.
Under 3. Encryption, choose whether or not to Require TLS encryption and click SAVE.
It may take up to 24 hours for the setting to start working.
You can come back here and click Edit to update it, Disable to turn it off temporarily or Delete to remove it permanently.
Add another mail service to your Google Workspace settings.
Get your emails delivered both to Google Workspace and another mail service at the same time.
Have your emails delivered to Google Workspace if the receiving email address exists in Google Workspace, otherwise deliver them to another mail service.
Set this up if you have another mail service and don’t want to receive mail at Google but still want to use Google Workspace email settings like spam filtering and routing.
Save a copy of all sent/received mail by non-Gmail mailboxes in users’ Gmail mailboxes as a backup.
Have emails sent from another mail server go through Google Workspace before delivery.
Have your incoming emails go through another mail server before they get delivered to Gmail.
Have emails sent from Google Workspace go through another mail server before delivery.
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