macOS Mail Error Code 1008: How to Fix It

Easy 10-30 minutes Medium Severity Verified July 2026
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Error Code
1008
Brand
macOS
Product Type
operating_system
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
10-30 minutes
macOS Mail error code 1008 means the Mail application is unable to establish a connection to your incoming or outgoing mail server. This is typically caused by incorrect account settings, a lost internet connection, an outdated SSL certificate, or a temporary block from the mail provider. The good news is that most cases can be resolved in minutes without any technical expertise by following the steps below.
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Tools You'll Need

How to Fix Error Code 1008

  1. Check Your Internet Connection

  2. Restart the Mail App

  3. Check Mail Server Status

  4. Verify Account Settings in Mail

  5. Re-enter Your Account Password

    Do not share your email password with anyone. Always generate app-specific passwords from the official provider website.

  6. Remove and Re-add the Email Account

    Removing an account will delete any locally stored drafts in that account. Make sure important drafts are saved or sent before proceeding.

  7. Reset the Keychain Entry for Your Mail Account

    Only delete Keychain entries related to your email account. Do not delete other system certificates or login items.

  8. Disable VPN or Firewall Temporarily

    Do not leave your firewall disabled permanently. Re-enable it as soon as you have confirmed whether it is the cause.

  9. Update macOS and Mail

    Back up your Mac using Time Machine before installing a major macOS update.

  10. Rebuild the Mail Envelope Index

    Keep the Envelope Index file on your Desktop until you confirm Mail is working. You can delete it afterward. Do not delete the entire Mail folder.
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When to Call a Professional

Contact Apple Support (support.apple.com) or visit an Apple Store if error 1008 persists after completing all steps, if multiple accounts are affected simultaneously, or if macOS Software Update fails to install. You should also contact your email provider's support team if you suspect your account has been locked or flagged for suspicious activity. If your Mac is under warranty or covered by AppleCare, hardware-level network issues can be diagnosed for free.

Frequently Asked Questions

What does macOS Mail error code 1008 mean?
Error code 1008 in macOS Mail means the Mail app was unable to connect to your email provider's incoming or outgoing mail server. It is usually caused by an incorrect password, wrong server settings, a network problem, a VPN blocking the connection, or a temporary outage on the mail provider's end.
Why does macOS Mail keep saying it cannot connect to the server?
Repeated connection failures in macOS Mail are most often caused by an expired or changed password, an SSL certificate mismatch, a blocked port from a firewall or VPN, or an outdated macOS version that no longer supports the server's security requirements. Re-entering your password and checking server settings resolves the problem in most cases.
How do I fix macOS Mail error 1008 for Gmail?
For Gmail, the most common fix is generating an app-specific password. Go to myaccount.google.com, navigate to Security > 2-Step Verification > App Passwords, and create a password for Mail on Mac. Then open Mail > Settings > Accounts, select your Gmail account, go to Server Settings, and replace your existing password with the 16-character app-specific password. Also confirm the IMAP server is imap.gmail.com on port 993 with SSL enabled.
Does removing an email account in macOS Mail delete my emails?
No, removing an email account from macOS Mail does not delete your emails from the server. IMAP and Exchange accounts store messages on the server, so they will reappear when you re-add the account. However, any unsent drafts stored only on your Mac will be lost, so send or back those up before removing the account.
Why did macOS Mail suddenly stop connecting after a macOS update?
macOS updates sometimes reset certain network or security settings, or they may enforce stricter SSL/TLS requirements that older server configurations do not meet. After an update, go to Mail > Settings > Accounts > Server Settings and toggle 'Automatically manage connection settings' off and back on to force Mail to refresh its connection parameters. Installing the latest macOS patch can also resolve issues introduced by a partial update.

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