How Do I Find My SMTP Server IP Address? Step-by-Step Guide

To find your SMTP server IP address, first identify your email provider (such as Gmail, Outlook, or your web hosting company), then locate the SMTP hostname in your email settings (for example, smtp.gmail.com) and use tools like DNS lookup, command prompt, or online MX/IP lookup services to resolve that hostname into its actual IP address. Once you have the IP, you can use it for firewall rules, server whitelisting, or advanced email troubleshooting.

Now let’s break this down properly, step by step, so you can find your SMTP server IP address no matter which email service you’re using.

How Do I Find My SMTP Server IP Address? Step-by-Step Guide

Step 1: Find Your SMTP Server Hostname (Most Important Step)

Before finding the IP, you must know the SMTP server name.

Common SMTP Hostnames

Where to find it:

• Email app settings (Outlook, Thunderbird, Apple Mail)

• Webmail → Email configuration

• Hosting provider documentation

Step 2: Find SMTP Server IP Using Command Prompt (Windows)

This is one of the fastest and most reliable methods.

Steps:

1. Press Windows + R

2. Type cmd and press Enter

3. Run this command:

   nslookup smtp.gmail.com


4. The result will show one or more IP addresses

Any listed IP can be used depending on your requirement.

Step 3: Find SMTP Server IP Using Terminal (Mac / Linux)

Command:

or

You’ll see multiple A records, which means multiple SMTP IPs are active.

Step 4: Find SMTP IP Address Using Online Tools (Beginner-Friendly)

Recommended Tools:

• MXToolbox

• DNS Checker

• WhatsMyDNS

How to use:

1. Open an SMTP lookup or DNS lookup tool

2. Enter your SMTP hostname (example: smtp.office365.com)

3. Select A Record

4. View returned IP addresses

Best for non-technical users
IPs may vary by location

Step 5: Find SMTP Server IP from Email Headers (Advanced)

If you already received an email from the SMTP server:

How:

1. Open the email

2. Click Show original / View headers

3. Look for:

   Received: from mail.example.com (123.45.67.89)


This shows the sending IP, not always the main SMTP relay.

Step 6: SMTP IP in cPanel or Web Hosting Email

If your email is hosted on c

Finding

Panel or a VPS:

Steps:

1. Login to cPanel

2. Go to Email Accounts

3. Click Connect Devices

4. Check:

   • SMTP hostname

   • Sometimes listed IP address

If IP isn’t shown, run:

Common SMTP Ports (Don’t Skip This)

Even with the correct IP, your connection may fail if the port is wrong.

Most providers recommend 587 with TLS

Why SMTP Servers Have Multiple IP Addresses

Don’t panic if you see many IPs.

Reasons:

• Load balancing

• Anti-spam protection

• Regional routing

• High availability

Best practice: use hostname instead of IP unless your use case demands IP (firewall, whitelist, monitoring).

When Do You Actually Need the SMTP IP Address?

You typically need it for:

• Firewall whitelisting

• Server-to-server email

• SMTP monitoring

• Deliverability diagnostics

• Email security appliances

• VPS email configuration

For email clients (Outlook, Gmail apps), hostname is enough.

Troubleshooting Tips

SMTP IP not responding?

• Check if port is blocked

• Verify SSL/TLS settings

• Test connectivity:

  telnet smtp.gmail.com 587


IP keeps changing?

• Normal behavior for cloud email providers

• Use hostname instead

Final Thoughts

Finding your SMTP server IP address is straightforward once you know the process:

1. Identify the SMTP hostname

2. Resolve it using DNS tools or command line

3. Understand that multiple IPs are normal

4. Use the IP only when absolutely required

For most users, SMTP hostname + correct port + authentication is all you need.
For advanced users, knowing the IP helps with security, diagnostics, and server control.