What is my SMTP username and password?

Your SMTP username and password are used to authenticate your email account when sending outgoing mail through an SMTP server. Here’s what you need to know about finding and using your SMTP credentials securely.

What is my SMTP username and password?

Understanding SMTP Authentication

SMTP, or Simple Mail Transfer Protocol, is the standard protocol used for sending email online. When you send an email from your email client or app, it connects to your email provider’s SMTP server and submits your outgoing message for delivery.

To prevent unauthorized use of their SMTP servers, most email providers require authentication using a username and password. Your SMTP credentials allow the server to verify your identity and confirm you have permission to send mail through that domain.

Some key things to know about SMTP authentication:

  • SMTP usernames are usually the full email address you registered with the email provider (e.g. [email protected]).
  • Passwords are unique credentials set up when creating the email account. They should always be kept secure and private.
  • POP3 and IMAP are different protocols used for retrieving incoming messages. Your SMTP credentials are separate from your POP3 or IMAP sign-in details.
  • Some email providers may use OAuth tokens or other secure methods instead of traditional usernames and passwords.
  • You may need to enable SMTP or IMAP/SMTP access in your email account settings before connecting a new email client.

Finding your SMTP settings

To locate your SMTP username and password, you’ll need to look in your email account settings. Here’s how to find your SMTP credentials for some common email providers:

Gmail SMTP Credentials

Gmail uses your full Gmail address as the SMTP username. For the password, you can use your regular Gmail account password or generate an App Password if using two-factor authentication.

To view your Gmail SMTP settings:

  1. Go to Gmail account settings
  2. Under “Send mail as,” click Edit Info next to your address.
  3. View your SMTP username, which is your full email address.
  4. Under “Password,” click Choose another way to sign in if you use 2FA and generate an App Password. Otherwise, your main Gmail password can be used.

Outlook/Hotmail SMTP Credentials

Your SMTP username for Outlook.com or Hotmail is typically your full email address. Your SMTP password is the same as your regular account password.

To find your Outlook.com SMTP details:

  1. Go to Outlook account settings
  2. Select your account name and click Edit mailbox.
  3. View your SMTP username, which is your full email address.
  4. Your SMTP password is the same password you use to sign in to your Outlook account.

Yahoo Mail SMTP Credentials

Yahoo Mail uses your full Yahoo email address as the SMTP username. The SMTP password is the same as your account password.

To find your Yahoo Mail SMTP details:

  1. Go to Yahoo account settings
  2. Click on Account security.
  3. View your SMTP username, which is your full Yahoo email address.
  4. Your SMTP password is the same as your Yahoo account password.
  5. Make sure “Allow apps that use less secure sign-in” is enabled if connecting a new email client.

iCloud SMTP Credentials

For iCloud email accounts, your SMTP username is your full iCloud email address, including @icloud.com. The SMTP password is the same as your iCloud account password.

To find your iCloud SMTP details:

  1. Go to Apple ID account settings
  2. View your SMTP username, which is your full iCloud email address.
  3. Your SMTP password is the same password you use to sign in to iCloud.

Other Providers

For other email providers, consult their help documentation for specifics on locating SMTP settings. Most will use your full email address and account password. Common alternative providers include Zoho, Fastmail, ProtonMail, GMX, and more.

Securing your SMTP credentials

Your SMTP username and password give access to your email account, so it’s important to keep them protected:

  • Never share your SMTP password publicly – Treat it as securely as your main account password.
  • Only enter your SMTP details into trusted apps and email clients – Avoid entering them on unfamiliar third-party sites.
  • Use an app-specific password if available – For better security with less trusted apps, use a unique randomly generated password if your provider offers that option. Gmail has App Passwords, for example.
  • Turn on two-factor authentication (2FA) – Adding a second authentication layer like SMS codes or authentication apps protects your account even if your password is compromised.
  • Change your SMTP password periodically – Update your SMTP credentials if you notice any suspicious activity or as general security maintenance every few months.

Using your SMTP credentials securely

When configuring a new email client, email forwarding service, or other app that needs to send email as you, here are some tips for securely using your SMTP credentials:

  • Only enter your SMTP username and password directly into the provider’s official apps, software, or website forms. Avoid third-party services asking for your SMTP details.
  • Look for options to use OAuth or token-based authentication instead of your actual password if available. This avoids exposing your real credentials.
  • Delete any cached or saved copies of your SMTP password from apps you no longer use. Don’t let old apps maintain access.
  • Use unique, complex passwords for your SMTP credentials, separate from passwords you use on other sites. Consider using a password manager.
  • Connect securely over encrypted HTTPS connections whenever possible. Avoid entering your SMTP details over plain unencrypted HTTP.
  • Check that the provider has proper security practices like encrypting stored credentials and requiring 2FA. Avoid services with a poor security reputation.

By keeping your SMTP username and password private and only using them when necessary with trusted providers, you can securely send email while minimizing the risk of account compromise.

Key takeaways

  • Your SMTP username is typically your full email address registered with the provider.
  • SMTP passwords are either your account password or a unique app password set up for the email provider.
  • Never share your SMTP credentials publicly or enter them on unfamiliar sites.
  • Enable two-factor authentication and change passwords periodically for better security.
  • Only enter SMTP details directly into official apps and email clients when needed.
  • Manage your credentials securely and disconnect any old apps you no longer use.


Your SMTP username and password authenticate your identity when sending outgoing emails through your email provider’s SMTP server. By keeping these credentials private and only using them when required in trusted apps, you can securely send mail while avoiding account misuse. Check your email provider’s help site for details on locating your exact SMTP settings. Enabling extra security options like two-factor authentication also adds an important layer of protection for your account.


Q: Can malware steal my SMTP credentials if my computer is infected?
A: Yes, malware is able to access saved passwords, keyloggers, memory scrapers, and other techniques to steal usernames and passwords.

Q: Why do some applications require SMTP server details?
A: Apps that send emails on your behalf need your SMTP details to authenticate and deliver those messages from your email address.

Q: Is it safe to enter my SMTP password if a website asks for it?
A: No, only enter your SMTP credentials directly into official apps or email client software when setting up a new account.

Q: How often should I change my SMTP password?
A: For good security hygiene, consider changing your SMTP password every few months or if you notice any suspicious activity on your email account.

Q: Can I use the same SMTP credentials for multiple email accounts?
A: No, you need to use the specific SMTP username and password associated with each individual email account.

Q: What are the risks of using public wi-fi to check my SMTP settings?
A: Public wi-fi is insecure and your login details could be intercepted. Only access your SMTP account over secured private networks.

Q: How do I reset my SMTP password if I forget it?
A: You’ll need to use your email provider’s standard password reset process, usually via email or security questions.

Q: Can SMTP usernames have special characters?
A: Yes, SMTP usernames can contain characters like periods, hyphens, and underscores if they are part of your full email address.

Q: Is SMTP used for sending and receiving emails?
A: SMTP is only used for sending outgoing emails. Protocols like POP3 and IMAP handle retrieving incoming messages.

Q: What are some alternatives to SMTP for sending emails?
A: Some alternatives include Sendmail, Postfix, and Exchange Server, but SMTP remains the predominant standard.

Q: Can I use the same SMTP server for multiple email domains?
A: No, you need to use the specific SMTP server for the domain, such as smtp.domain.com for accounts on that domain.

Q: How long does an SMTP password need to be?
A: Most providers require at least 8-10 characters but longer complex passwords are recommended for better security.

Q: Can I change my SMTP username?
A: Typically no, the SMTP username is tied to your registered email address. You’d need to create a new account to change it.

Q: Is SMTP used for sending emails between servers?
A: Yes, SMTP facilitates transferring messages between the mail servers of the sender and the recipient.

Q: Do SMTP passwords expire?
A: Passwords usually don’t expire automatically but providers may require periodically changing for security. Check your email provider’s policies.

Q: Can SMTP require authentication for incoming mail?
A: SMTP is only used for outgoing mail. POP3 or IMAP would handle any authentication requirements for incoming mail.

Q: How is an SMTP login different than webmail login?
A: Your SMTP credentials are for sending mail while webmail logins are for accessing your inbox from a browser interface.

Q: Can I upgrade to SMTP encryption if not supported?
A: Encryption like STARTTLS depends on server support. You’d need to switch to a provider offering encrypted SMTP.

Q: Should I avoid clicking SMTP password reset links in emails?
A: Yes, only reset your password through your provider’s site. Links could lead to phishing sites stealing your details.

Q: What are the signs my SMTP account has been hacked?
A: Indicators may include receiving bounce messages from unknown sent emails, Account login notifications you didn’t trigger, and contacts receiving spam from your address.

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