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Why is Gmail SMTP not working?

Author

Rachel Ellis

Published Jan 07, 2026

In Google Mail, you must allow "less secure" apps access in order for your SMTP settings to work. There are two places this setting must be enabled: The first is here: under “Connected apps & sites.”In Google Mail, you must allow "less secure" apps access in order for your SMTP settings to work. There are two places this setting must be enabled: The first is here: google.com

google.com

Google Spaces was a mobile app for group discussions and messaging developed by Google. The app was intended to compete with Slack as a content sharing platform where users can create a "space", invite their friends for discussion, and share videos, images, text, and other media.

› wiki › Google_Spaces

/ under “Connected apps & sites.”

Why is SMTP not sending emails?

Check whether there is network access from CSO to the SMTP server. Check whether the firewall is blocking SMTP traffic to SMTP server or whether the ports are blocked. If the server settings and authentication settings are correct, check whether the firewall is blocking port 587 and 465 and SMTP traffic.

How do I enable Gmail SMTP?

  1. In your Google/Gmail account, go to Settings.
  2. Select the 'Forwarding and POP/IMAP' settings.
  3. Under the 'IMAP access' section, toggle on the option to 'Enable IMAP. ...
  4. In your Accredible instance, click on 'Emails' at the top of your Accredible dashboard.
  5. In the left-hand sidebar menu, click on 'SMTP Overrides.

Does Gmail still support SMTP?

Use the Gmail SMTP server

If you connect using SSL or TLS, you can send mail to anyone inside or outside of your organization using smtp.gmail.com as your server. This option requires you to authenticate with your Gmail or Google Workspace account and passwords.

Why are my emails not sending in Gmail?

The email is taking a long time to send

Make sure you're connected to Wi-Fi or mobile data. If you're on a slow connection, it could take a while for your email to send. If you sent the email from an email client, like Apple Mail or Outlook, try sending it from mail.google.com or the Gmail app instead.

39 related questions found

Can receive Gmail but Cannot send?

Double-check recipients and email details. Make sure you've configured the Gmail server properly. Clear cache and data. Reinstall Gmail.

Why are my Gmail emails going to outbox and not sending?

Check If Gmail Is in Offline Mode

It allows users to read, respond and delete emails without an internet connection. Once you get back online, it automatically sends out all your emails from the outbox. If you've been using this feature, it can also be the reason why your emails are stuck in Gmail's outbox.

Can't connect to SMTP host?

There are many popular cases for the failure of SMTP connection in PHPMailer and lack of SSL is one of that too. There might be a case, that the Open SSL extension is not enabled in your php. ini which is creating the connection problem. So, once you enable the extension=php_openssl.

How do I know if my SMTP relay is working?

How to manually test if an SMTP server can receive email

  1. From the Windows Start Menu select Start->Run and enter CMD as the application to open. Select OK.
  2. At the command prompt, enter the following: telnet mail.mailenable.com 25. ...
  3. Type the word QUIT and then press enter.

Is Google SMTP relay free?

That's why using an outgoing SMTP server like Google SMTP is an excellent choice since it provides a free and reliable solution, especially for sites with low mail volumes. In this article, you've learned how to use the Google SMTP server in two ways — through a custom domain and using a WordPress plugin.

How do I fix a SMTP error?

How to fix issues with sending email (SMTP)

  1. Open the settings for your email in the application or device you are using.
  2. Locate the outgoing SMTP server and its settings.
  3. Check the current outgoing port and change it to 26 or 587.
  4. Make sure any username and password fields are filled in if shown.
  5. Save changes and test.

How do I enable SMTP?

Enable SMTP AUTH for specific mailboxes

  1. Open the Microsoft 365 admin center and go to Users > Active users.
  2. Select the user, and in the flyout that appears, click Mail.
  3. In the Email apps section, click Manage email apps.
  4. Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.

What is SMTP server for Gmail?

The outgoing SMTP server, smtp.gmail.com , requires TLS. Use port 465 , or port 587 if your client begins with plain text before issuing the STARTTLS command.

How do I find my SMTP relay settings?

SMTP relay test

Select Actions in the left-hand corner of the tool and click Connect. Enter your SMTP server information: server name and port. Keep the LocalIp option as a default. Click Connect.

How do I find my email SMTP server?

Web-Based Solutions

  1. Navigate your Web browser to the mxtoolbox.com diagnostic page (see Resources).
  2. In the Mail Server text box, enter the name of your SMTP server. ...
  3. Check the working messages returned from the server.

How do you check SMTP port is open or not?

Press Enter. Type telnet MAILSERVER 25 (replace MAILSERVER with your mail server (SMTP) which may be something like server.domain.com or mail.yourdomain.com). Press Enter. If that port is blocked, you will receive a connection error.

What is SMTP host error?

The SMTP server is often specified as a hostname in the mail settings of the software. A DNS failure or temporary issues can affect the name resolution of the mail server. In such scenarios, the mailing software will not be able to contact the SMTP server, causing connection errors.

What does SMTP error could not authenticate mean?

“smtp error: could not authenticate” is a common error when users send emails via PHPMailer using SMTP authentication. This error occurs when the application can't establish an SMTP connection to the mail server.

How do I force Gmail to outbox?

Reopen gmail. In the sent mail screen it should say that you have unsent mail in your outbox. go to your outbox and refresh (pull the screen down). it should change to uploading. I hope that helps you too!

Why is my email stuck in outbox Gmail?

Clear Data of Gmail App (Android Devices).

If you are using an Android phone to access Gmail, you can try clearing its data to solve the issue on the app. It is possible that the Gmail App on your phone encountered a temporary glitch or some of its files got corrupted during use or while updating the app.

Why are my emails stuck in outbox?

An email can also get stuck in the Outbox if it has a very large attachment. Your email provider may block emails with attachments larger than a size they specify. For general email performance, it is not recommended that you send an attachment larger than a few megabytes.

What is SMTP path?

An SMTP transaction consists of three command/reply sequences: MAIL command, to establish the return address, also called return-path, reverse-path, bounce address, mfrom, or envelope sender. RCPT command, to establish a recipient of the message. This command can be issued multiple times, one for each recipient.

Can SMTP receive email?

SMTP server: explained

But SMTP servers don't work in both directions; they can only deliver outgoing mail, not receive incoming messages. The counterpart for receiving emails would be POP3 or IMAP.

Is SMTP still used?

SMTP, which is specified in RFC 5321, uses port 25 by default. It may also use port 587 and port 465. The latter, which was introduced as the port of choice for secure SMTP (a.k.a. SMTPS), is supposed to be deprecated. But in reality, it's still being used by several mail service providers.

Can SMTP be used to receive email?

SMTP stands for Simple Mail Transfer Protocol and it's the industry standard protocol for email sending. With SMTP you are sending, relaying, or forwarding messages from a mail client (like Microsoft Outlook) to a receiving email server.