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#Office 365 smtp settings how to#

The new TXT record value for SPF looks like this: v=spf1 mx include: ip4:93.172.139.251 -all The effect is that it will also authorize the organization’s Public IP address servers to send emails for the domain name. The TXT record value for SPF looks like this: v=spf1 mx include:Įdit the existing SPF record and add the Public IP address. Sign in to the domain’s registrar and open the domain DNS settings. The most secure way is to only add the Exchange Online IP addresses in the destination address and not ALL (everyone). To relay through Office 365 SMTP, you need to open port 25 from the organization firewall to external.

Copy the Points to address or value field.

Go through the wizard and find the MX record.

To find Office 365 MX record, follow these steps: The MX record l is what you will add to the scanner or application that needs to relay SMTP using Office 365. In our example, it’s the Public IP address 93.172.139.251. Note: Get the public IP address from the organization you want to send mail from. Note down the Public IP address because you need it in the next step. Go to or any other website that reveals your public IP address.

Open port 25 on the organization firewall.

Find Public IP address from where it will send the emails.

When you set up Office 365 SMTP relay, you will need to:

#Office 365 smtp settings how to#

Let’s look at how to configure a connector in Exchange Online for on-premises devices and applications for SMTP relay. Most IT environments have some applications or devices that need to send emails, such as:

How to set up SMTP relay for Office 365.