When connecting your mailbox in a third-party email client (Outlook, Apple Mail, Thunderbird, etc.) or a custom app, you typically need IMAP (incoming) and SMTP (outgoing) server details, plus an app password or authorization code—not your web login password.Documentation Index
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Key concepts
| Term | Description |
|---|---|
| IMAP | Syncs mail on the server; ideal for multiple devices |
| SMTP | Outgoing protocol used to send email |
| App password | A standalone ~16-character password for third-party apps; can be revoked anytime |
| Authorization code | Client-specific password used by some providers (e.g. QQ, NetEase 163); not your login password |
| OAuth | Some clients support OAuth sign-in and do not require an app password |
Browse by provider
Gmail / Google
App passwords and IMAP/SMTP settings
Outlook / Microsoft
Microsoft app passwords and server settings
Yahoo Mail
Yahoo app passwords and IMAP/SMTP
iCloud Mail
Apple app-specific password setup
AOL Mail
AOL app passwords and server settings
Zoho Mail
Zoho app passwords and IMAP/SMTP
QQ Mail
Authorization codes and server settings
NetEase 163 / 126
Authorization codes and IMAP/SMTP
Proton Mail
Bridge and paid IMAP options
Quick reference
| Provider | App password / auth code | IMAP server | SMTP server |
|---|---|---|---|
| Gmail | Google app password | imap.gmail.com:993 | smtp.gmail.com:465 or :587 |
| Outlook | Microsoft app password | outlook.office365.com:993 | smtp.office365.com:587 |
| Yahoo | Yahoo app password | imap.mail.yahoo.com:993 | smtp.mail.yahoo.com:465 |
| iCloud | Apple app-specific password | imap.mail.me.com:993 | smtp.mail.me.com:587 |
| AOL | AOL app password | imap.aol.com:993 | smtp.aol.com:465 |
| Zoho | Zoho app password | imap.zoho.com:993 | smtp.zoho.com:465 |
| Mail authorization code | imap.qq.com:993 | smtp.qq.com:465 | |
| 163 / 126 | Mail authorization code | imap.163.com:993 | smtp.163.com:465 |
FAQ
Connection failed: username or password incorrect
Connection failed: username or password incorrect
Confirm you are using an app password or authorization code, not your web login password. For Gmail, verify IMAP is enabled in the web settings. For QQ/163, regenerate the authorization code if it expired or after re-enabling the service.
SMTP fails but IMAP works
SMTP fails but IMAP works
Check that the SMTP port matches the encryption method (465 for SSL, 587 for STARTTLS). Some networks block ports 465/587—try switching ports or networks.
Cannot find Google app passwords
Cannot find Google app passwords
You must enable two-step verification first. Google Workspace admins may disable this feature. Some account types that sign in only through Google do not support app passwords.
Outlook requires Modern Authentication
Outlook requires Modern Authentication
Enterprise Microsoft 365 may disable basic authentication. Use an OAuth-capable client, or ask your IT admin to enable SMTP AUTH if policy allows.
After setup, test both incoming (IMAP) and outgoing (SMTP) once in your client before using the account in production or automation.