--- title: 15 Best Practices for Protecting Your Email with SecurityGateway™ description: Top 15 email security settings to protect your business from spam, phishing, malware, data leaks & email-borne threats with SecurityGateway for Email image: https://blog.mdaemon.com/hubfs/Email-Security-Best-Practices.jpg --- [![MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/MDaemon-Technologies_logo_large.png?width=564&height=110&name=MDaemon-Technologies_logo_large.png "MDaemon Technologies")](https://mdaemon.com/) - [Blog Home](https://blog.mdaemon.com) # MDaemon Technologies Blog ## [15 Best Practices for Protecting Your Email with SecurityGateway™](https://blog.mdaemon.com/15-best-practices-for-protecting-your-email-with-security-gateway) By [Brad Wyro](https://blog.mdaemon.com/author/brad-wyro) - [Tweet](https://twitter.com/share) ![businessman hand pointing to padlock on touch screen computer as Internet security online business concept](https://blog.mdaemon.com/hs-fs/hubfs/Stock%20images/businessman%20hand%20pointing%20to%20padlock%20on%20touch%20screen%20computer%20as%20Internet%20security%20online%20business%20concept.jpeg?quality=low&width=712&name=businessman%20hand%20pointing%20to%20padlock%20on%20touch%20screen%20computer%20as%20Internet%20security%20online%20business%20concept.jpeg)   Despite the rumors announcing the death of email, its use continues to grow. According to research, email traffic is predicted to grow to [over 424 billion](https://www.statista.com/statistics/456500/daily-number-of-e-mails-worldwide/?srsltid=AfmBOoqyzDZQ0wF3-Qfqb09zgIr2vFreZLU15asxPEjL8fBz-HzojLN5)emails sent per day by 2028. And as long as businesses continue to use email, cybercriminals will find new ways to exploit security gaps, software bugs, and basic human nature to extort millions of dollars from their victims. That’s why you need the additional protection offered by [SecurityGateway for Email](https://mdaemon.com/pages/security-gateway)to protect against email-borne threats.      ## **Here are our top 15 recommendations to protect your business from email-borne threats with SecurityGateway™**       SecurityGateway[![Email Security best practices with SecurityGateway by MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/In-a-Hurry.jpg?width=252&name=In-a-Hurry.jpg)](https://blog.mdaemon.com/hubfs/How%20To/Email%20Server%20Settings%20-%20Best%20Practices.pdf) was designed to be easy to use while providing the strongest protection against spam, phishing, and data leaks. And while most security settings are configured for optimal protection by default, it’s a good idea to follow these guidelines for best results.   ### Verify That a User is Valid before Creating an Account With every incoming message addressed to an unknown local user, SecurityGateway needs to be able to verify that the account is a valid local user by [querying Microsoft 365, Active Directory, MDaemon, or another data source](https://help.mdaemon.com/SecurityGateway/en/user_verification_sources.html) before creating the account and delivering the message. We recommend using one the user verification sources found in SecurityGateway to validate accounts. *![User verification in SecurityGateway for Email - User can be verified against Microsoft 365, Microsoft Exchange Server, G-Suite, and other email platforms.](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-User-Verification-Microsoft-365.png?width=711&height=400&name=SecurityGatewy-User-Verification-Microsoft-365.png) User verification options to validate users by querying Microsoft 365, Active Directory, MDaemon, or an LDAP data source*   ### Use SMTP Authentication to Prevent Unauthorized Account Access To help prevent unauthorized account access, we recommend requiring SMTP Authentication unless a message is transmitted from a domain mail server. *![SecurityGatewy SMTP Authentication settings](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-SMTP-Authentication.png?width=711&height=400&name=SecurityGatewy-SMTP-Authentication.png) SMTP authentication settings in SecurityGateway for Email* ### Use Strong Passwords Spammers will often try to hijack an email account by guessing its password. Therefore, passwords that are easy to guess should always be avoided. If SecurityGateway is configured to create accounts automatically by querying a user verification source, then make sure your user verification source is configured to require strong passwords. Passwords can also be assigned to users manually via the Domains and Users menu.   ### Enable Dynamic Screening Enable [Dynamic Screening](https://www.altn.com/Products/SecurityGateway-Email-Firewall/Security-Features/#Screening)to block connections that exhibit suspicious activity, such as failing too many authentication attempts, connecting too many times in a given time frame, attempting to keep a connection open too long, or sending to too many invalid recipients. Dynamic Screening makes it more difficult for a malicious person to guess passwords by detecting the malicious activity and blocking the connections. ![Dynamic Screening in SecurityGateway by MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Dynamic-Screening.png?width=711&height=401&name=SecurityGatewy-Dynamic-Screening.png) *Dynamic Screening Settings in SecurityGateway for Email* ### Enable Account Hijack Detection If a spammer guesses an account’s password, he can then use that account to send out spam. To limit the spammer’s ability to abuse a compromised account, enable Account Hijack Detection, and then enter the maximum number of messages that can be sent in a given time frame. Once the limit has been reached, the account is disabled and the administrator is notified. ![Account hijack detection in SecurityGateway for Email by MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Account-Hijack-Detection.png?width=711&height=400&name=SecurityGatewy-Account-Hijack-Detection.png) *Prevent compromised email accounts from abuse with Account Hijack Detection in SecurityGateway for Email* ### Enable at Least One Default Mail Server When email arrives for a domain that has not been assigned its own mail server, SecurityGateway needs to know where to send those messages. We recommend adding a default mail server for all Security Gateway domains that have not had domain mail servers specifically associated with them. ![SecurityGateway for Email - Default mail server](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Default-Mail-Server.png?width=711&height=402&name=SecurityGatewy-Default-Mail-Server.png) *SecurityGateway - Default mail server settings*   ### Prevent Unauthorized Mail Relaying Relaying occurs when mail that is neither to nor from a local account is sent through your server. Servers that are not properly configured to prevent relaying can end up on a blacklist. By default, SecurityGateway does not allow mail relaying. *![SecurityGatewy for Email - Relay Settings - Spam Filter for Microsoft 365, Microsoft Exchange & other email platforms](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Relay-Settings.png?width=711&height=401&name=SecurityGatewy-Relay-Settings.png) Relay Control Settings in SecurityGateway for Email*   ### Protect Your Domain with IP Shielding [IP Shielding](https://help.mdaemon.com/SecurityGateway/en/ip_shielding.html)is a security feature that only honors SMTP sessions claiming to be from someone at one of the listed domains if they are coming from an IP address associated with that domain. The best way to secure outbound email is via SMTP authentication. However, for businesses that need to send email from a printer or other device that is not capable of authenticating, IP Shielding can be used to exclude certain IP’s or ranges from having to authenticate. Messages from authenticated sessions can optionally be exempt from IP Shielding requirements. ![IP Shield in SecurityGateway for Email. The IP Shield provides an alternative way to authentication to SMTP authentication](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-IP-Shield.png?width=711&height=400&name=SecurityGatewy-IP-Shield.png) *Protect against email spoofing with IP Shielding in SecurityGateway for Email*   ### Enable SSL to Ensure Data Privacy To protect the privacy of transmitted data, we recommend enabling the SSL encryption features for SMTP and HTTP. ![SSL and TLS in SecurityGateway for Email](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-SSL-TLS.png?width=711&height=401&name=SecurityGatewy-SSL-TLS.png) *SSL & TLS settings in SecurityGateway for Email*   ### Enable Backscatter Protection Most spam messages contain a forged return path. This often leads to users receiving thousands of delivery status notices, auto-responders, and other messages in response to messages that the user never sent. This is known as backscatter. To combat backscatter, SecurityGateway’s [Backscatter Protection](https://help.mdaemon.com/SecurityGateway/en/backscatter_protection.html) feature can help to ensure that only legitimate Delivery Status Notifications and auto-responders get delivered to your domains. ![Backscatter protection in SecurityGateway for Email](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Backscatter-Protection.png?width=711&height=401&name=SecurityGatewy-Backscatter-Protection.png) *Backscatter Protection Settings in SecurityGateway for Email*   ### Don’t Whitelist Local Email Addresses In many cases, local IP addresses or host names may need to be whitelisted. However, we do not recommend whitelisting local email addresses. If a local address is added to the whitelist, messages sent to this address could bypass many of your security settings and put your server at risk of being blocklisted.   ### Protect your Email Infrastructure from Virus and Spam Outbreaks SecurityGateway scans all inbound and outbound mail using the Ikarus and ClamAV antivirus engines. It also includes [Outbreak Protection](https://help.mdaemon.com/SecurityGateway/en/outbreak_protection.html), which is real-time anti-spam and antivirus technology that is capable of proactively protecting your email infrastructure automatically and within minutes of an outbreak. ![Virus scanning in SecurityGateway for Email using Ikarus and ClamAV](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Antivirus.png?width=711&height=401&name=SecurityGatewy-Antivirus.png) *Antivirus settings in SecurityGateway for Email*   ### Prevent Data Leaks SecurityGateway includes over 70 Data Leak Prevention rules to help prevent unauthorized transmission of sensitive information such as personal identification numbers, credit card numbers, and other types of confidential data. These rules can be configured to send messages containing sensitive content to the administrative quarantine for further review, redirect the message to a designated address, or encrypt the message. SecurityGateway can also check for medical terms to prevent sensitive information from getting into the wrong hands. We recommend enabling the appropriate Data Leak Prevention rules to suit the needs of your specific business or industry. *![Data leak prevention (DLP) in SecurityGateway for Email](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Data-Leak-Prevention_DLP.png?width=711&height=400&name=SecurityGatewy-Data-Leak-Prevention_DLP.png) Data Leak Prevention in SecurityGateway for Email *   ### Enable Location Screening Use [Location Screening](https://help.mdaemon.com/MDaemon/en/screening_location-screening.html)to block inbound SMTP and HTTP connections from unauthorized countries. If your company has no legitimate business need to communicate with a particular country, then refusing connections from that country can potentially block large amounts of spam. Alternatively, you can configure Location Screening to only prevent authentication from unauthorized countries. ![Location Screening in SecurityGateway for Email](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGatewy-Location-Screening.png?width=711&height=400&name=SecurityGatewy-Location-Screening.png) *Block email from unauthorized countries with Location Screening in SecurityGateway for Email*   ### Enable Macro Detection in Microsoft Office Documents Cybercriminals often use macros in email attachments to spread malware. In SecurityGateway, the Virus Scanning settings include an option to [detect macros in Microsoft Office documents](https://help.mdaemon.com/SecurityGateway/en/virus_scanning.html)and flag them as infected. Security Gateway can refuse these messages or quarantine them for administrative review. [![Download "Settings to Protect Your Mail Server"](https://blog.mdaemon.com/hs-fs/hubfs/Imported_Blog_Media/Download-the-_Settings-to-Protect-your-Mail-Server_-How-to-Guide.png?width=270&height=75&name=Download-the-_Settings-to-Protect-your-Mail-Server_-How-to-Guide.png)](https://blog.mdaemon.com/hubfs/How%20To/Email%20Server%20Settings%20-%20Best%20Practices.pdf) SecurityGateway provides accurate spam filter protection, email encryption, data leak prevention (DLP), archiving & compliance, and much more for Microsoft 365, Microsoft Exchange Server, Google Workspace & other email  platforms. We offer a fully-functional 30-day free trial.[Click here to get started](https://mdaemon.com/pages/downloads-security-gateway-free-trial)!         Tags: [Email Security](https://blog.mdaemon.com/topic/email-security), [Security Gateway for Email](https://blog.mdaemon.com/topic/security-gateway-for-email), [Email Security Best Practices](https://blog.mdaemon.com/topic/email-security-best-practices), [Two-Factor Authentication](https://blog.mdaemon.com/topic/two-factor-authentication), [Email Best Practices](https://blog.mdaemon.com/topic/email-best-practices) ![Brad Wyro](https://blog.mdaemon.com/hs-fs/hubfs/Brad-2023v2.jpg?width=100&height=100&name=Brad-2023v2.jpg) #### Written by [Brad Wyro](https://blog.mdaemon.com/author/brad-wyro) Brad has worked in technical and marketing roles at MDaemon Technologies, where he contributes as Content Marketing Manager. Brad balances technical and creative information to develop easy to understand videos and content to educate prospects and customers. 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[Disaster Recovery (1)](https://blog.mdaemon.com/tag/disaster-recovery) - [Email Collaboration (1)](https://blog.mdaemon.com/tag/email-collaboration) - [Email Software Reviews (1)](https://blog.mdaemon.com/tag/email-software-reviews) - [Encrypt (1)](https://blog.mdaemon.com/tag/encrypt) - [External Email Threats (1)](https://blog.mdaemon.com/tag/external-email-threats) - [Gateway (1)](https://blog.mdaemon.com/tag/gateway) - [Inbox (1)](https://blog.mdaemon.com/tag/inbox) - [Inbox Zero (1)](https://blog.mdaemon.com/tag/inbox-zero) - [Macros (1)](https://blog.mdaemon.com/tag/macros) - [Monitoring (1)](https://blog.mdaemon.com/tag/monitoring) - [Quarantine (1)](https://blog.mdaemon.com/tag/quarantine) - [RelayFax (1)](https://blog.mdaemon.com/tag/relayfax) - [Software (1)](https://blog.mdaemon.com/tag/software) - [Training (1)](https://blog.mdaemon.com/tag/training) - [Upgrade (1)](https://blog.mdaemon.com/tag/upgrade) - [Windows Server (1)](https://blog.mdaemon.com/tag/windows-server) - [internal email threat (1)](https://blog.mdaemon.com/tag/internal-email-threat) - [ssl (1)](https://blog.mdaemon.com/tag/ssl) - [tax scams (1)](https://blog.mdaemon.com/tag/tax-scams) See all #### About MDaemon Technologies MDaemon Technologies is a pioneer in developing email and email security software helping to protect customers from evolving cyber-security threats. Its products and services are trusted by thousands of organizations in over 140 countries. For more than two decades, the company’s products have been developed with the ongoing input of IT professionals who demand reliable, affordable software that requires minimal effort to manage. The software can be deployed in virtual, hosted cloud, on-premises, or hybrid network environments. The company sells its software and services directly and through a network of global channel partners. For more information, visit [www.mdaemon.com](https://www.altn.com/). Copyright © 1996-2026 MDaemon Technologies.  View [privacy policy](https://mdaemon.com/policies/privacy-policy).   ###### Contact Us +1.817-601-3222 [sales@help.mdaemon.com](mailto:sales@help.mdaemon.com) 6340 Lake Worth Blvd. Fort Worth, TX 76135 ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Brad Wyro", "url" : "https://blog.mdaemon.com/author/brad-wyro" }, "dateModified" : "2026-07-14T19:19:02.040Z", "datePublished" : "2020-02-10T17:57:30.000Z", "headline" : "15 Best Practices for Protecting Your Email with SecurityGateway™", "image" : [ "https://blog.mdaemon.com/hubfs/Email-Security-Best-Practices.jpg" ], "mainEntityOfPage" : { "@id" : "https://blog.mdaemon.com/15-best-practices-for-protecting-your-email-with-security-gateway", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.mdaemon.com/hubfs/MDaemon-Technologies_logo_large.png" }, "name" : "MDaemon Technologies" } } ```