SMTP Server

The 'HELP' command is disabled. This is a good security practice.

The SMTP 'HELP' command allows users to request assistance from the mail server. If enabled, it may reveal information about the server, its software version, or available commands, which could be exploited by attackers.

The mail server is not listed on any known blacklists. No action is needed.

Mail servers often block messages from IP addresses that have been blacklisted due to sending spam or malicious emails. If your server's IP is blacklisted, your emails may be rejected, marked as spam, or never delivered.

The 'EXPN' command is disabled. This prevents enumeration of mailing lists and improves security.

The SMTP 'EXPN' (Expand) command allows users to retrieve the actual recipients of a mailing list or alias. Attackers can exploit this to gather valid email addresses for phishing or spam campaigns.

The mail server announces supported authentication methods.

SMTP Authentication (SMTP AUTH) allows mail clients to authenticate with the mail server before sending emails. This enhances security by preventing unauthorized users from relaying mail through your server.

The mail server may be vulnerable to email spoofing. Attackers can send fake emails appearing to come from your domain.

Email spoofing occurs when an attacker forges the 'From' field in an email header to impersonate a trusted sender. Without properly configured SPF and DMARC records, recipients may be tricked into believing a fake email is legitimate, increasing the risk of phishing and fraud.

The mail server does not appear to be vulnerable to open relay. This prevents unauthorized users from sending emails through your server.

An open mail relay allows anyone to send emails through your SMTP server without authentication. Spammers can exploit open relays to send bulk spam or phishing emails, which can result in blacklisting and service degradation.

The 'VRFY' command is disabled. This prevents attackers from verifying valid email addresses.

The SMTP 'VRFY' (Verify) command checks if a specific email address exists on the server. If enabled, attackers can use it to confirm valid email addresses for spam or targeted attacks.

All mail servers have valid reverse DNS (PTR) records. This improves email deliverability and trust.

A PTR (reverse DNS) record maps an IP address to a domain name. Many mail servers require a valid PTR record to accept emails, and its absence can cause emails to be rejected or marked as spam.

DMARC record is correctly configured. This helps protect against email spoofing and phishing.

DMARC (Domain-based Message Authentication, Reporting & Conformance) protects against email spoofing and phishing by enforcing email authentication policies using SPF and DKIM.

SPF record is missing or invalid. This may allow unauthorized senders to spoof your domain.

SPF is an email authentication method that specifies which mail servers are authorized to send emails on behalf of your domain. A properly configured SPF record helps prevent email spoofing and improves deliverability.