Port 995: POP3S — Complete Guide

Port 995 is reserved by IANA for the POP3S service. POP3 over TLS. Legacy replacement for port 110.

To find out if port 995 is open on your host (or a third-party's — for diagnostics), use our port checker. Enter a domain and a port number — results arrive in 1-2 seconds.

Check port 995 →

An open port is a potential attack vector. General rules:

• Close everything you don't use (firewall default-deny)
• For admin ports (22 SSH, 3389 RDP, 3306 MySQL) — IP whitelist or VPN
• Base cases: 80+443 open for web; 22 — from work/VPN only; DB ports — loopback only
• Use fail2ban for SSH/admin panels

Port 995 is primarily associated with the Post Office Protocol version 3 Secure (POP3S), which adds a layer of security to the traditional POP3 protocol by using Transport Layer Security (TLS). This encryption ensures that emails exchanged between the client and server are protected from eavesdropping and tampering.

When a client connects to a mail server over port 995, the initial connection is made using the TLS protocol. This means that all data transferred, including user credentials and email content, is encrypted. The security process involves a handshake where the server presents its SSL certificate, and the client verifies its authenticity before establishing a secure connection.

Using POP3S over port 995 is crucial for organizations that prioritize data privacy and compliance with regulations such as GDPR or HIPAA, as it prevents unauthorized access to sensitive information during transmission.

To ensure that your email server is using POP3S securely, it's essential to implement the following best practices:

• Regularly update your server software to protect against vulnerabilities.
• Use strong, unique passwords for your email accounts.
• Enable two-factor authentication (2FA) where possible.
• Monitor access logs for any suspicious activity.

Configuring your email client to use POP3S on port 995 is a straightforward process. Below are the steps for popular email clients, ensuring that you can securely retrieve your emails.

1. Microsoft Outlook:

• Open Outlook and go to File > Account Settings.
• Select New to add a new account.
• Choose POP as the account type.
• Enter your name and email address.
• For the incoming mail server, input your mail server's address followed by :995.
• Check the option Use SSL to connect (recommended).
• Enter your username and password, then click Next.

2. Mozilla Thunderbird:

• Open Thunderbird and click on Account Settings.
• Select Server Settings under your email account.
• Change the port to 995 and select SSL/TLS as the connection security.
• Ensure that Authentication method is set to Normal password.

3. Apple Mail:

• Open Apple Mail and go to Mail > Preferences.
• Select your account and click on Server Settings.
• Set the incoming mail port to 995 and select Use Secure Socket Layer (SSL).

Following these steps will ensure that your email client is securely configured to retrieve emails using POP3S over port 995.

While using port 995 for POP3S, users may encounter various issues that can hinder their email retrieval process. Understanding these common problems and their solutions can help maintain seamless email communication.

1. Connection Timeouts: If your email client cannot connect to the server over port 995, it may be due to network issues or server downtime. To troubleshoot:

• Check your internet connection to ensure it's stable.
• Verify that the mail server is operational by pinging it or checking its status online.

2. Incorrect SSL/TLS Settings: If the settings are not configured to use SSL/TLS, the connection will fail. Double-check that SSL/TLS is enabled in your email client settings and that the correct port (995) is being used.

3. Firewall or Antivirus Interference: Sometimes, firewalls or antivirus software can block the connection to port 995. To resolve this:

• Temporarily disable your firewall/antivirus and try reconnecting.
• If the connection works, add an exception for your email client within the firewall/antivirus settings.

4. Authentication Failures: If you encounter login errors, verify that your username and password are correct. Additionally, ensure that your email account is not locked or disabled due to multiple failed login attempts.

By following these troubleshooting tips, users can effectively resolve common issues associated with using port 995 for POP3S, ensuring a smooth email experience.