--- title: "SMTP Gateway: Office 365 Setup | DuoCircle" description: "Join the thousands of organizations that use DuoCircle Find out how affordable it is for your organization today and be pleasantly surprised.Interested in" image: "https://www.duocircle.com/images/og-default.png" canonical: "https://www.duocircle.com/content/smtp-gateways/smtp-gateway-office/" --- Content # SMTP Gateway: Office 365 Setup Join the thousands of organizations that use DuoCircle Find out how affordable it is for your organization today and be pleasantly surprised.Interested in [ Talk to an Expert → ](/contact/) [ See what we make ](/products/) ## SMTP Gateway: Office 365 Setup [Fix Your SPF Errors Now](/content/spf-permerror) If your office has a scanner or other line-of-business (LOB) application, you’ll want to streamline how emails are sent to both you, your colleagues, and your clients. By linking your Office 365 account to an [SMTP gateway](/content/smtp-gateways), _you’ll be able to do things such as send scanned documents from a scanner to anyone you wish_. This article will tell you how to do it. ![smtp email hosting](https://media.mailhop.org/duocircle/images/2019/03/two-email-impersonation-1.png) ### Use client submission _This should be the first option you try since it’s the easiest_. To [authenticate your device](https://thenextweb.com/future-of-communications/2016/02/17/the-ultimate-guide-to-selecting-a-device-authentication/) or app, connect directly to Office 365’s client submission endpoint. This will enable you to send emails from outside of Office 365. MORE: [SMTP gateway service](/content/smtp-gateways/smtp-gateway-service) ### Use a connector To send email, [SMTP server](/content/smtp-gateways/smtp-server) can be used. However, this method is more difficult, since you have to [configure a connector](https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/use-connectors-to-configure-mail-flow). _This sets up an email relay that works with your IP address or TLS certificate._ Although this method is harder to set up, you don’t need to create a connector if you already have a hybrid environment. _We recommend you only try this method if the other two don’t work for you._ Because using an [SMTP relay service](/content/smtp-gateways/smtp-relay-service) requires the use of the internet, you should always make sure you have **protection against malware**. _This will prevent cybercriminals from intercepting emails with sensitive information._ MORE: [SMTP relay](/content/smtp-gateways/smtp-relay) ![smtp service](https://media.mailhop.org/duocircle/images/2019/02/increased-phishing-attacks.png) ##### Join the thousands of organizations that use DuoCircle --- Find out how affordable it is for your organization today and be pleasantly surprised. [Outbound SMTP - Sign Up FREE](/email/outbound-smtp)Interested in our Partner Program for MSPs and VARs? Visit Our [MSP Partner Program](/msp-partner-program). ## Ready to talk? Same-day response from someone technical. We tell you yes or no quickly. If yes, we get to work. [Talk to an Expert→](/contact/)[See what we make](/products/) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. We deliver about 90% of category-leader capability at roughly half the price, backed by experts who own the outcome. 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