How to find SMTP address?

Finding your SMTP server address allows you to configure email clients and applications to send outgoing emails via your email provider’s SMTP server. This guide will walk through locating the SMTP settings for some common email providers like Gmail, Outlook, Yahoo and more.

How to find SMTP address?

Why do you need an SMTP address?

An SMTP or “Simple Mail Transfer Protocol” server functions like the post office for your email account. It takes the outgoing emails you send and handles transmitting them across the internet to the recipient’s email provider.

To send emails from desktop email clients and apps rather than just via a webmail interface, those programs need to be configured with the SMTP server details for relaying the messages. So finding and entering the SMTP address allows your emails to get delivered correctly.

Where to find SMTP server settings

Many email providers make finding SMTP connection details easy by providing them openly or having specific sections of the account settings dedicated to locating this info.

Here’s where to access SMTP address and port configurations for some top email platforms:


  • Sign into your Gmail account
  • Click on the Settings gear icon
  • Select See all settings
  • Go to the Forwarding and POP/IMAP tab
  • Under the “Send mail as” section, note the SMTP details

Gmail SMTP server address:


  • Sign into your Outlook account
  • Click on Settings > View all Outlook settings
  • Go to Mail > Email accounts
  • Select your account and click Edit > More settings
  • Under the “Outgoing server” section, view the SMTP details

Outlook SMTP server address:

Yahoo Mail

  • Sign into Yahoo Mail
  • Click on Settings icon
  • Go to Account Info
  • Scroll down and click on “View details” under “Server Settings”
  • The SMTP server address and ports will be shown

Yahoo SMTP address:


  • Sign into your iCloud account
  • Click on the Settings icon
  • Go to the Accounts section
  • Choose your iCloud account and check the SMTP server settings

iCloud SMTP details:


Port: 587

Security: STARTTLS

And so on for other providers like Zoho, Fastmail, GMX,,, etc. Most email platforms make it easy to find these technical details somewhere in the admin account settings area.

Checking with your email IT department

If you use an email address provided by an organization like your work or school, there may be custom SMTP servers set up that you need to use instead. Check with your IT or email administrators for guidance.

Some common internal SMTP naming conventions to try include:

  • or
  • smtp1 / smtp2 / etc

Without the correct SMTP IP address and configurations from IT, the emails may not send properly externally. So ask if unsure.

Finding SMTP details manually

If you can’t locate the SMTP settings in the email provider’s control panel or get them from IT staff, there are ways to manually find and test potential servers.

A common technique is to check the full email header of a message in your sent folder, looking for lines with a Received: from entry pointing to an SMTP relay server address.

You can also use the command line tool nslookup to try to DNS resolve common server naming formats associated with the email platform or domain.

Various online SMTP checking tools are also available which will validate if an address and port functions for sending mail.

However these manual methods involve more technical knowledge. So check account settings first before resorting to hunting down SMTP specifics yourself.

Why security protocols matter

As outlined in the iCloud example earlier where the SMTP port was 587 and the security was STARTTLS, the protocol used to secure the connection is also vital for proper configuration.

Common protocols include:

  • Plain text – no encryption applied
  • SSL – encrypted SMTP transport
  • TLS or STARTTLS – encrypted after handshake

Using the right security method along with the server, port and authentication settings allows your SMTP emails to transmit safely and avoids insecure mail rejections.

Key things to remember

When entering SMTP details to set up email accounts, key things to confirm include:

  • SMTP server address – e.g.
  • Connection port – commonly 25, 465 or 587
  • SSL/TLS or other security – match provider requirements
  • Authentication – user/password or access keys
  • Valid credentials – ensure API keys or account details are active

With the proper SMTP configurations applied, you can start sending emails successfully through external mail clients and apps rather than just via webmail in the browser.


Finding and applying the SMTP server address for your email account is essential to enable adding that email identity into desktop programs and alternative mail solutions. All the main email platforms offer instructions in their help guides and account settings for locating the needed technical specifications like server details, ports and security protocols to use when setting up SMTP mail access. Following the steps outlined for your email provider makes configuring custom apps and clients easy.

Key Takeaway

The key steps for finding an SMTP server address involve checking:

  • The email provider’s account settings control panel
  • Manual email header analysis
  • IT staff support for work/school accounts
  • Online SMTP checking tools

Capturing the necessary server, port, security and authentication values allows properly sending SMTP mail through any compatible email program.

Frequently Asked Questions

  1. What is an SMTP address?
    An SMTP address refers to the server name that handles sending outgoing email for an email provider account, such as for Gmail.
  2. Where do I find SMTP server settings?
    SMTP details are usually found in the account settings area of email provider admin panels, or by contacting IT staff for organizational email accounts.
  3. Why do I need to know my SMTP address?
    Configuring the SMTP mail server and port is necessary to send outgoing emails from desktop clients and apps rather than just a webmail interface.
  4. What protocols are used for SMTP security?
    Common security protocols include plain text (none), SSL/TLS for encrypted transports and STARTTLS for upgrading after initial connection.
  5. How do I know if an SMTP address is valid?
    Trying to manually telnet to an SMTP port like 25 or 587 can validate if an address and port is accessible. Online SMTP checking tools also assist with verification.
  6. Can I use any SMTP address?
    No, you can generally only use the designated SMTP servers associated with your email address domain that grants access for sending outward messages.
  7. What details do I need to configure SMTP?
    Key settings needed include server address, connection port, security protocol, authentication method and valid credentials.
  8. What if I can’t find my SMTP settings?
    If not openly provided by the email platform or IT staff, you may have to manually analyze email headers to try extracting SMTP server details.
  9. Should I enable SMTP authentication?
    Yes, using authentication and app passwords/keys avoids account security issues from open relay risks without validation checks.
  10. Why is my SMTP mail getting rejected?
    Common SMTP errors include invalid credentials, insecure protocols, bloc listing if previously exploited and rate limiting.
  11. How do I troubleshoot SMTP issues?
    Start by validating all settings match provider requirements, check blacklists for IP blocks, and confirm credentials are active and not rate limited.
  12. Can I use the same SMTP credentials in multiple email clients?
    Yes, you can generally utilize SMTP login credentials in as many desktop mail apps as needed.
  13. What are common SMTP port numbers?
    Typical default ports include 25, 465 and 587. Port 25 is increasingly blocked on consumer ISP networks.
  14. Is port 25 or 587 better for SMTP?
    Port 587 is generally preferred for TLS/STARTTLS encrypted connections, with 25 more associated with plain text transmissions.
  15. What gets logged when sending SMTP mail?
    By default nothing, but most SMTP servers record IP addresses and timestamps to comply with data regulations. Enable logging for troubleshooting.
  16. Does SMTP support read receipts?
    Basic SMTP does not include read receipt support natively, but some mail clients can request them as extensions.
  17. Can I change the default SMTP port assignments?
    The ports used can be reassigned on server side, but the standards of 25, 465 and 587 should be maintained for compatibility.
  18. What is the difference between IMAP vs SMTP?
    IMAP handles receiving/reading emails while SMTP focuses solely on sending outgoing mail.
  19. How do spammers send mail?
    Most spammers exploit open relay SMTP servers with weak security to queue mass volumes of malicious mail through unsuspecting hosts.
  20. Why am I unable to route mail to certain domains?
    Some providers blocklist specific domains due to past spam abuse. Maintaining sending reputation and proper configurations avoids routing blocks.

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