Top 10 Tips To Secure Your Email Server
- Configure mail relay options to avoid being an Open Relay
It is Extremely Important to configure your email relay parameter To be very restrictive. All mail servers have this option, where you are able to specify which domains or IP addresses that your email server will relay mail for. For whom your SMTP protocol ought to forward email, To put it differently, this parameter specifies. Misconfiguration of the choice can harm you since spammers may use your mail server (and network tools ) as a gateway for spamming others, resulting in your getting blacklisted.
- Establish to control user access
SMTP Authentication compels the Individuals who use your host to Obtain consent to send email by supplying a username and password. This helps to stop relay and abuse of your server. Just accounts can utilize your servers SMTP to send email, if configured the correct way. When your email server includes a routed IP address, this configuration is highly recommended.
- Limit connections to protect your server from DoS Strikes
The Amount of connections into your SMTP server Ought to Be Limited. These parameters depend on the specifications of the server hardware (memory, NIC bandwidth, CPU, etc.) and its nominal load every day. The parameters used to take care of connection limits include: total number of links , total number of connections, and link speed. To maintain optimal values might require refinement.
This could be very beneficial to mitigate DoS and spam floods Attacks that target your system infrastructure.
- Activate Reverse DNS to block senders
Most messaging systems use DNS lookups to confirm the Presence of the senders email domain. A lookup is an option for fighting mail senders off. After Reverse DNS Lookup is activated, your SMTP verifies the senders IP address matches both the domain name and domain names that were submitted by the SMTP client in the EHLO/HELO command.
This is very beneficial for blocking messages that fail the Address matching test.
- Utilize DNSBL personal server and email abuse to fight
One of the most important configurations for shielding your Email server is to use DNS-based blacklists. Checking if the sender domain name or IP is known by DNSBL servers world-wide (e.g., Spamhaus, etc.), could reduce substantially the sum of received spam. Activating this option and using a maximum number of DNSBL servers may significantly decrease the effect of unsolicited incoming email
DNSBL servers list all known spammers IPs and domains for This particular objective.
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- Activate SPF to prevent spoofed sources
Sender Policy Framework (SPF) is a method used to stop Spoofed sender addresses. Nowadays, the majority of violent email messages carry fake sender addresses. The SPF test ensures that the sending MTA is allowed to send email on behalf of their senders domain name. When SPF is triggered on your own server, the sending servers MX record (the DNS Mail Exchange record) is validated before message transmission takes place.
- Enable SURBL to verify message content
SURBL (Spam URI Real-time Block Lists) detects unwanted Email based inside a message on malicious or invalid links. Having a SURBL filter helps to shield users from phishing and malware attacks. At present, not all mail servers support SURBL. However, if your messaging server will not support it, triggering it will increase your server security, as well as the security of your complete network because over 50 percent of online security risks come from email content.
Having a Regional IP blacklist in your email server is quite Significant for countering. Maintenance of the list can take time and resources, but it brings actual added-value. The result is a speedy and reliable way to prevent unwanted Internet connections from disrupting your messaging program.
- Encrypt POP3 and IMAP authentication for privacy concerns
POP3 and IMAP connections Weren’t originally built with Security in mind. As a result, they are often used without strong authentication. This is a big weakness since users passwords are transmitted in clear text through your mail server, thus making them easily accessible to hackers and people with malicious intent. SSLTLS is the best known and easiest way to implement strong authentication; it is widely used and believed reliable enough.
- Have at least 2 MX records for failover
This is the last, but not least suggestion. Having a Failover configuration is important for accessibility. Is not adequate for ensuring a continuous flow of email into a given domain, That is why it’s strongly recommended to install at least two MXs for each Domain name. The first one is set as the primary, and the secondary is utilized if the Primary goes down for any reason. This setup is performed on the DNS Zone level.