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Whether configuring an on-premises multi-function printer, scanner (scan to email), or application that needs to send email, there will be configuration to send SMTP email. If some or all of your mailboxes are in Office 365, there are a few options available to you. The following table will help you to decide which one is the right one for you based on your needs and the device's configuration options.
Each configuration option contains a link at the top to more detailed documentation with the steps and additional considerations.
Exchange Online Relay
Exchange Online Protection Relay
Direct send *
Configure a user, device, or line-of-business (LOB) application to send mail as a single SMTP address for a domain you own
Configure a user, device, or line-of-business (LOB) application to send mail as multiple senders who may not have Office 365 mailboxes, including to Internet recipients
Configure a user, device, or line-of-business (LOB) application to directly send email to Office 365 (& Internet) recipients
Send to recipients in your domain(s)
Relay to Internet via O365
No (Direct delivery only)
Port 587 or 25; TLS required; dynamic IPs allowed
Port 25; TLS optional; one or more static IP Addresses are required (e.g., cannot use this method with Azure or addresses on a Policy Block List)
Port 25; TLS optional
Yes (If device does not support this option, you can use on-premises IIS SMTP relay)
Yes – for mails destined to your Office 365 mailboxes
No – suspicious emails may be filtered; custom SPF record recommended
10,000 recipients per day
Reasonable limits - service cannot be used to send spam
Can use a standard or shared mailbox
Requires Exchange Online Protection licenses for each sender; Office 365 mailboxes have this license
Email sender licensing not required
FQDN of SMTP Endpoint
Where contoso.com is your domain. To obtain the string for your domain, go to Domains in Office 365 Portal
No endpoint required. Use DNS based routing.
* While this scenario is technically not a Relay scenario, it is included as a possible solution, particularly if relay to Internet recipients is not required or if there are email servers on-premises that handle direct delivery of email.
View recording & slides for Webcast that covers these scenarios
This method of relaying allows Exchange Online Protection to relay your mail authenticated only by your IP address. If your device accepts a username/password and supports TLS, it is suggested to use Exchange Online Relay method instead. The below method will only work if the device is able to send unauthenticated email.
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