How to fix outlook blocking emails in and out

First verify or reset the mailbox password with the ISP, then update Classic Outlook with that password and the ISP’s current incoming and outgoing server settings.

1. Verify the account with the ISP

1. Sign in to the ISP’s webmail site using the full email address and password.
2. If webmail also rejects the password, reset it through the ISP or contact its email support. Outlook cannot correct a password rejected by the provider.
3. If the ISP requires two-step verification, ask whether Outlook must use an app password instead of the normal password. Microsoft notes that some third-party accounts require one. ^1^

Password changes must be made with the email provider first; Outlook should then request the updated password when opened. ^2^

2. Correct the account settings in Classic Outlook

Obtain these current settings from the ISP:

• Account type: IMAP or POP
• Incoming server name, port, and encryption type
• Outgoing SMTP server name, port, and encryption type
• Authentication requirements
• Whether the username must be the complete email address

Then:

1. Open Outlook → File → Account Settings → Account Settings.
2. Select the ISP account and choose Change or Server Settings.
3. Enter the full email address as the username and the verified password.
4. Make the incoming and outgoing server names, ports, and SSL/TLS settings match the ISP’s instructions exactly.
5. If an IMAP settings page shows Require logon using Secure Password Authentication (SPA), leave it unchecked unless the ISP specifically requires SPA.
6. Save the settings, restart Outlook, and select Send/Receive All Folders.

Microsoft’s Classic Outlook guidance identifies an incorrect username, an expired or changed password, and incorrect POP/IMAP settings as causes of repeated prompts and send/receive failures. ^1^

3. If Outlook still rejects valid webmail credentials

Repair the configured account:

1. Go to File → Account Settings → Account Settings.
2. On the Email tab, select the ISP account.
3. Choose Repair, complete the prompts, and restart Outlook. ^3^

If Repair is unavailable or unsuccessful, add the account again manually:

1. Open Control Panel → Mail → Email Accounts.
2. Select New.
3. Enter the ISP account details and password.
4. If automatic setup fails, choose manual setup and enter the ISP’s IMAP/POP and SMTP details.
5. Confirm the new account can send and receive before removing the old configuration. ^1^

Conditional checks

• If Outlook’s status bar says Working Offline, open Send/Receive and select Work Offline to return online. ^4^
• If the Send/Receive error is 0x800CCC80, the ISP might require authentication with the incoming server before SMTP sending; Outlook documents account repair or enabling Log on to incoming server before sending mail for that specific error. ^5^
• If none of these resolves it, record the complete Send/Receive error message and code, whether the account is IMAP or POP, and the status shown at the bottom of Outlook. Provide those details—without posting the password—to the ISP, because it can confirm whether SMTP/IMAP access is enabled or blocked for the mailbox.

References

1. Troubleshoot Outlook email setup | Microsoft Support
2. Change or update your email password in Outlook for Windows
3. Outlook Issue - Microsoft Q&A
4. [Classic Outlook](https://support.microsoft.com/outlook/i-can-t-send-or-receive-messages-in-outlook#make-sure-you're-connected-to-the-internet)
5. Sending mail from Outlook results in error 0x800ccc80