Top 10 Tips To Secure Your Email Server
- Configure email relay choices to avoid being an Open Relay
It’s Extremely Important to configure your email relay parameter To be very restrictive. Where you can specify which domain names or IP addresses your mail server will relay mail for all email servers have this choice. To put it differently, this parameter specifies for whom your SMTP protocol should mail. Misconfiguration of this option can hurt you because spammers can use your mail personal server(and network resources) as a gateway for spamming others, resulting in your getting blacklisted.
- Set up to control user access
SMTP Authentication compels Obtain permission to send mail and password. This helps to prevent abuse and open relay of your own server. If configured the way, just known accounts may utilize your servers SMTP to send email. Whenever your email server includes a routed IP address, this configuration is recommended.
- Restrict connections to protect your server from DoS Attacks
The Amount of links to your SMTP server should be Restricted. Include: total amount of connections, total number of links, and maximum connection rate. To maintain optimal values may require refinement over time.
This could be very beneficial to mitigate spam floods and DoS Attacks that aim your network infrastructure.
4.Messaging systems utilize DNS lookups to verify the Names before accepting a message, existence of the senders email domain. A reverse lookup is an interesting solution for fighting fake mail senders off. After Reverse DNS Lookup is activated, your SMTP verifies the senders IP address matches the host and domain names that were submitted by the SMTP client from the EHLO/HELO command.
This is valuable for blocking Address test.
- Use email abuse to be fought by DNSBL servers
One of the configurations that are most important for shielding your Email server would be to use blacklists. Assessing whether the sender domain name or IP is known by DNSBL servers worldwide (e.g., Spamhaus, etc.), can reduce substantially the amount of received junk. Activating this option and using a maximum amount of DNSBL servers may significantly reduce the effect of unsolicited incoming email.
DNSBL servers listing spammers IPs and domains for This objective.
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- Activate SPF to prevent spoofed sources
Sender Policy Framework (SPF) is a technique used to prevent Sender addresses. These days, nearly all abusive email messages carry fake sender addresses. The SPF check guarantees that the sending MTA is allowed to send mail on behalf of their senders domain . When SPF is activated on your server, the sending servers MX record (the DNS Mail Exchange record) is supported before message transmission takes place.
- Enable SURBL to confirm message content
Email based within a message on hyperlinks. Possessing a SURBL filter will help to protect customers from malware and phishing attacks. At present, not all mail servers support SURBL. However, in case your messaging server does support it, activating it’s going to boost your own server security, in addition to the safety of your entire network since over 50 percent of online security threats come from email content.
- Maintain local IP blacklists to block spammers
Possessing a IP blacklist in your server is very Significant for countering. Maintenance of the list can take time and resources, but it attracts real added-value. The outcome is a quick and reliable way to prevent unwanted Internet connections from bothering your messaging system.
9.POP3 and IMAP connections were not originally built with Safety in mind. Without authentication, they are utilized as a result. This is a big weakness because users passwords are sent in clear text through your mail server, thus making them readily accessible to hackers and people with malicious purpose. SSLTLS is the best known and simplest way to implement strong authentication; it is widely used and believed reliable enough.
- Have at least two MX records for failover
This is the final, but not least, important suggestion. Possessing a Failover configuration is quite crucial for availability. Having one MX record Is not adequate for ensuring a continuous flow of mail into a given domain, Which is the reason why it’s strongly suggested to set up at least 2 MXs for each Domain. The very first one is set as the first, and the secondary is used if the This configuration is done on the DNS Zone level.