Are your emails not syncing? Missing emails, delayed messages, or folders not updating can seriously disrupt your workflow. Email sync problems commonly affect users of Microsoft Outlook, Gmail, Apple Mail, and Mozilla Thunderbird.

This step-by-step guide will help you fix email server sync issues quickly and get your email working again.

What is an Email Server Sync Issue?

An email sync issue occurs when your email client fails to communicate properly with the email server.

Common Symptoms

• Emails not receiving
• Emails not sending
• Delayed email notifications
• Missing folders
• Deleted emails reappearing

Common Causes of Email Sync Issues

Here are the most common reasons:

1. Incorrect Email Server Settings

Wrong IMAP or SMTP settings can stop syncing.

2. Poor Internet Connection

Slow or unstable internet prevents syncing.

3. Outdated Email Client

Older software causes compatibility issues.

4. Authentication Errors

Password or security issues interrupt syncing.

5. Email Storage Full

If your mailbox is full, syncing stops.

6. Server Downtime

Email provider server may be temporarily unavailable.

Email Server Sync Issue Fix (Step-by-Step)

Follow these steps to fix the issue:

Step 1: Check Your Internet Connection

• Restart router
• Switch network
• Disable VPN

Weak internet is the most common cause.

Step 2: Restart Your Email Client

Close and reopen your email application:

• Outlook
• Gmail
• Thunderbird
• Apple Mail

This fixes temporary sync errors.
 

Step 3: Verify Email Server Settings

Check your IMAP and SMTP settings.

Example Gmail Server Settings

Incoming Server (IMAP)

• Server: imap.gmail.com
• Port: 993
• SSL: Yes

Outgoing Server (SMTP)

• Server: smtp.gmail.com
• Port: 587
• TLS: Yes

Step 4: Enable IMAP

IMAP must be enabled for syncing.

Enable IMAP

1. Log in to email
2. Open Settings
3. Enable IMAP
4. Save changes

Step 5: Update Email Client

Check updates for:

• Outlook
• Gmail
• Windows
• Mac

Outdated apps cause sync issues.

Step 6: Remove and Re-Add Email Account

This method fixes most sync issues:

1. Remove account
2. Restart email client
3. Add the account again
4. Enter credentials

Step 7: Disable Antivirus or Firewall

Security software sometimes blocks syncing.

Try:

• Disable antivirus temporarily
• Test email sync
• Whitelist email client

Read More: Email Server Sync Issue Fix