Gmail IMAP Settings: Complete Setup Guide

Gmail IMAP Settings (Incoming Mail)

Gmail SMTP Settings (Outgoing Mail)

Use port 587 with TLS — it's the modern standard. Port 465 (SSL) is legacy but still works.

Before You Start: Enable IMAP in Gmail

IMAP might be disabled by default. Here's how to turn it on:

1. Open Gmail in your browser
2. Click the gear icon (top right) then "See all settings"
3. Go to the "Forwarding and POP/IMAP" tab
4. Under IMAP access, select "Enable IMAP"
5. Click "Save Changes"

For Google Workspace accounts: Your admin may need to enable IMAP access. Go to Admin Console then Apps then Google Workspace then Gmail then User settings.

App Passwords: Required for Most Clients

If you have 2-Factor Authentication (2FA) enabled — which you should — most email clients can't use your regular Gmail password. You need an App Password.

How to Generate an App Password

1. Go to myaccount.google.com/apppasswords
2. Sign in to your Google Account
3. Select "Mail" as the app
4. Select your device (or choose "Other" and name it)
5. Click "Generate"
6. Google gives you a 16-character password — copy it
7. Use this password instead of your regular password in your email client

Important: App Passwords are only available if 2FA is enabled. If you don't see the option, enable 2FA first at myaccount.google.com/security.

Note: Google is phasing out App Passwords for some accounts in favor of OAuth2. If your email client supports OAuth2 (Outlook, Thunderbird, Apple Mail), use that instead.

Setup: Apple Mail (Mac/iPhone)

Mac

1. Open Apple Mail
2. Go to Mail then Add Account then Google
3. Sign in with your Google account (uses OAuth2 — no App Password needed)
4. Apple Mail auto-configures IMAP and SMTP

iPhone/iPad

1. Go to Settings then Mail then Accounts then Add Account
2. Select Google
3. Sign in with your Google account
4. Toggle Mail on
5. Done — IMAP settings are configured automatically

Setup: Microsoft Outlook

Outlook for Windows (New)

1. Open Outlook then File then Add Account
2. Enter your Gmail address and click Connect
3. Outlook auto-detects Gmail and uses OAuth2
4. Sign in to Google when prompted
5. Done

Outlook for Windows (Classic/Manual)

1. File then Add Account then Manual setup
2. Select IMAP
3. Enter the settings from the tables above
4. Use your App Password for the password field
5. Click Next and let Outlook test the connection

Outlook for Mac

1. Open Outlook then Outlook then Preferences then Accounts
2. Click + then New Account
3. Enter your Gmail address
4. Outlook auto-configures using OAuth2

Setup: Mozilla Thunderbird

1. Open Thunderbird then Account Settings then Account Actions then Add Mail Account
2. Enter your name, Gmail address, and App Password
3. Thunderbird auto-detects settings (IMAP on port 993, SMTP on port 587)
4. If auto-detect fails, click Manual config and enter:
   • Incoming: imap.gmail.com, port 993, SSL/TLS
   • Outgoing: smtp.gmail.com, port 587, STARTTLS
5. Click Done

Setup: Windows Mail

1. Open Mail app then Settings then Manage Accounts then Add Account
2. Select Google
3. Sign in with your Google account (OAuth2)
4. Toggle Mail sync on
5. Done

Setup: Third-Party Apps and Services

For apps that don't support OAuth2 (older email clients, IoT devices, scripts), use the manual IMAP/SMTP settings with an App Password:

Incoming (IMAP):
  Server: imap.gmail.com
  Port: 993
  Security: SSL/TLS
  Username: you@gmail.com
  Password: [16-char App Password]

Outgoing (SMTP):
  Server: smtp.gmail.com
  Port: 587
  Security: STARTTLS
  Username: you@gmail.com
  Password: [16-char App Password]
  Authentication: Yes

IMAP vs POP3: Which to Use

Use IMAP unless you have a specific reason not to. It's the modern standard.

Gmail IMAP Limits

Gmail imposes limits on IMAP connections:

• Maximum simultaneous connections: 15 per account
• Bandwidth limit: ~2.5 GB/day (download) and ~500 MB/day (upload)
• Connection timeout: 30 minutes of inactivity
• IMAP folder limit: 10,000 labels/folders

If you hit limits: You'll see errors like "Too many simultaneous connections" or "Bandwidth exceeded." Close unused email clients, reduce sync frequency, or sync only recent mail.

Google Workspace IMAP Settings

For Google Workspace (business Gmail) accounts, the settings are identical:

The only difference: your admin may need to enable IMAP and/or App Passwords in the Google Admin Console.

Troubleshooting

"Authentication failed" or "Wrong password"

• Most common cause: Using your regular Google password instead of an App Password
• Fix: Generate an App Password and use that
• If no App Password option: Enable 2FA first, or check if your admin disabled App Passwords

"Connection timed out" or "Cannot connect to server"

• Check your internet connection
• Verify the server address (imap.gmail.com, not imap.google.com)
• Verify the port (993 for IMAP, 587 for SMTP)
• Make sure SSL/TLS is selected (not "None")
• Check if your firewall or antivirus is blocking ports 993/587

"Too many simultaneous connections"

• Close email clients on other devices
• Reduce the number of IMAP folders being synced
• Check for stuck connections (restart your email client)

Emails not syncing

• Verify IMAP is enabled in Gmail settings
• Check that you're syncing the right folders/labels
• Try removing and re-adding the account
• Check Gmail storage — if you're over quota, sync may fail

Sent emails not appearing in Gmail

• Make sure your client saves sent mail to "[Gmail]/Sent Mail" folder
• In Thunderbird: Account Settings then Copies and Folders then save sent to Gmail's Sent folder
• In Outlook: check the "Save sent items" setting

Gmail SMTP for Sending Applications

If you're configuring Gmail SMTP for a web application, CRM, or automation tool:

Host: smtp.gmail.com
Port: 587
Security: TLS/STARTTLS
Username: you@gmail.com
Password: [App Password]
From: you@gmail.com

Gmail sending limits:

• Free Gmail: 500 emails/day
• Google Workspace: 2,000 emails/day

For sending beyond these limits — especially cold email — you need dedicated infrastructure.

ColdRelay provides unlimited sending capacity at $1 per mailbox:

• No daily sending caps like Gmail
• Pre-configured SPF, DKIM, DMARC
• Built for outbound volume
• Each mailbox is independent — scale as needed

Gmail SMTP works for transactional and personal email. For cold outreach at scale, dedicated infrastructure is essential.

FAQ

Can I use Gmail IMAP for free?

Yes. Gmail IMAP is free for all Gmail accounts (personal and Workspace). The only cost is if you need Google Workspace for a custom domain ($6-18/user/month).

Does IMAP use my Gmail storage?

Yes. IMAP keeps emails on Gmail's server, which counts toward your 15 GB free storage (or Workspace storage limit). Deleting emails in your client also deletes them from Gmail.

Can I use Gmail IMAP with multiple email clients?

Yes. That's one of IMAP's main advantages — all clients stay in sync because they're reading from the same server.

Is Gmail IMAP secure?

Yes, when using SSL/TLS (port 993). All data is encrypted in transit. Never use unencrypted IMAP (port 143) with Gmail.

Why does Gmail show "[Gmail]" folders in my email client?

Gmail uses labels, not traditional folders. IMAP maps Gmail labels to folders, and system labels appear under a "[Gmail]" parent folder (Sent Mail, Drafts, Trash, etc.).

---

Gmail IMAP works for personal email. When you need to send at scale, ColdRelay provides the infrastructure — $1/mailbox, no limits, full deliverability.