Top 10 Tips to Secure Your Email Server
- Configure email choices carefully to prevent being an Open Relay
It’s Extremely Important to configure your mail relay parameter To be very restrictive. Where you can specify which domains or IP addresses your mail server will relay mail for, all mail servers have this option. For whom your SMTP protocol ought to mail, in other words, this parameter specifies. Misconfiguration of this option can harm you since spammers can use your mail personal server (and network tools ) as a gateway for others, leading to your getting blacklisted.
- Establish SMTP authentication to control user access
SMTP Authentication forces the Individuals who use your server to Obtain permission to send email and password. This helps to stop abuse and open relay of your own server. Only known reports may use your servers SMTP to send email, if configured the way. This setup is recommended whenever your mail server includes a routed IP address.
- Limit connections to protect your server Attacks
The Amount of connections into your SMTP server Ought to Be Limited. The key parameters used to handle connection limitations include: connection rate amount of connections, and total number of connections. To maintain optimum values for these parameters may require refinement over time.
This could be very helpful to mitigate DoS and spam floods Attacks that target your system infrastructure.
4.Messaging systems utilize DNS lookups to verify the Existence of the senders email domain. A reverse lookup is also an interesting option for fighting bogus mail senders off. After Reverse DNS Lookup is triggered, your SMTP verifies that the senders IP address matches both the host and domain names which were filed by the SMTP client in the EHLO/HELO command.
This is very beneficial for blocking messages that fail the Address matching test.
- Utilize DNSBL servers and email abuse to Resist
Among the configurations that are most important for protecting your Server would be to use blacklists. Assessing if the sender domain name or IP is understood by DNSBL servers worldwide (e.g., Spamhaus, etc.), can cut down considerably the amount of received junk. Activating this option and with a maximum number of DNSBL servers will greatly decrease the impact of unsolicited incoming email.
DNSBL servers listing spammers IPs and domain names for This particular objective.
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- Activate SPF to stop 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 ensures that the sending MTA is allowed to send mail on behalf of their senders domain name. When SPF is activated on your server, the sending servers MX record (the DNS Mail Exchange record) is validated before message transmission takes place.
- Enable SURBL to confirm message content
Email based within a message on malicious or insulting links. Possessing a filter helps to shield users from malware and malware attacks. Currently, not all mail servers support SURBL. However, in case your messaging server does support it, triggering it will boost your server security, in addition to the security of your entire network because more than 50% of online security risks come from email content.
- Maintain IP blacklists to block spammers
Possessing a IP blacklist in your server is very For countering important. Maintenance of the list may take resources and time, but it brings actual added-value. The outcome is a quick and reliable way to prevent unwanted Internet connections from disrupting your messaging system.
- Encrypt POP3 and IMAP authentication for privacy concerns
POP3 and IMAP connections were not originally built with Safety in mind. As a result, they are utilized without authentication. This is a big weakness because users passwords are transmitted in clear text via 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 2 MX records for failover
This is the last, but not least tip. Possessing a Failover configuration is important for accessibility. Is never sufficient for ensuring a continuous stream of email to a given domain, Which is the reason why it’s strongly recommended to install at least 2 MXs for each Domain. The very first one is set as the primary, if the and the secondary is used Primary goes down for any reason. This setup is performed on the DNS Zone level.