--- title: "Set Up Postfix Backup MX To Ensure That The Email Delivery Is Not Interrupted | 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/backup-mx/postfix-backup-mx/" --- Content # Set Up Postfix Backup MX To Ensure That The Email Delivery Is Not Interrupted 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/) ## Set Up Postfix Backup MX To Ensure That The Email Delivery Is Not Interrupted [MX Backup - Sign Up](/email/email-backup-mx) Postfix backup MX (Mail Exchanger) was developed to compensate for the drawback of the traditional email server since it bounces incoming emails while the server is offline. A [free backup MX](/content/backup-mx/free-backup-mx), such as the [NoIP backup MX](/content/backup-mx/noip-backup-mx) or the Postfix backup MX, acts as an **MX backup** and connects the clients to a different WAN IP address using a separate internet connection. However, _these [backup email servers](/content/backup-mx/backup-email-server) have lower priority than the MX DNS record_. Postfix is the MTA (Mail Transfer Agent) that delivers emails to users’ inbox and [backup MX records](/content/backup-mx/backup-mx-record). ![backup mx](https://media.mailhop.org/duocircle/images/2020/11/secondary-mx.png) ### Postfix Greylisting Since [backup MX](/content/backup-mx) servers have a lower priority, _spammers use them as a channel to spread malware and other malicious threats to victims_. It can be fixed to an extent using postfix backup MX, which can be set to bounce back any email from unknown senders or domains. On the other hand, if the sender’s identity and domain name are **verified and legitimate**, the email is forwarded to the user’s mailbox. _Another merit of postfix backup MX is that the messages can be lined up on the server_, and users can control how long to queue the emails before sending them back to the user. ### Disadvantages Of Postfix MX Host The main disadvantages of using postfix backup MX for businesses are discussed below. - If not queued up efficiently, an email will become useless since most emails require immediate action within a few days. - [Backscatter by postfix](http://www.postfix.org/BACKSCATTER%5FREADME.html) server following a rejection from the **primary MX server** could result in sending non-delivery reports to genuine senders. - An additional connection and integration protocols to work in the absence of a mail server could increase operations’ complexity. - Spamming becomes less complicated and effortless due to the lower priority of the [postfix MX server](https://www.howtoforge.com/postfix%5Fbackup%5Fmx). An additional mail exchanger, such as the postfix backup MX, can be a useful tool as _it will queue up the emails when the primary MX goes down and delivers it to the clients later_. It also finds application in **efficient spam rejection** to a pretty good extent. ![backup email server](https://media.mailhop.org/duocircle/images/2020/11/mail-queue-service.png) ##### Join the thousands of organizations that use DuoCircle --- Find out how affordable it is for your organization today and be pleasantly surprised. [MX Backup - Sign Up](/email/email-backup-mx)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. 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