How to Fix “Apple Mail Stuck on Downloading Messages” Error? 10 Easy Fixes (2026 Guide)
If your Mac Mail app is stuck on “Downloading Messages,” you’re not alone. Many Mac users on macOS 26 and other latest macOS versions face this issue where emails stop syncing, loading takes forever, or the Mail app freezes while downloading messages. This problem usually happens because of poor internet connection, corrupted mailbox files, outdated macOS versions, or incorrect IMAP settings. In this article, we’ll explain the best solutions to fix the Apple Mail stuck on downloading messages issue on Mac and iPhone.
Why Is Apple Mail Stuck on Downloading Messages?
Before fixing the issue, it’s important to understand why it happens. Some common reasons include:
- Slow or unstable internet connection
- Corrupted Apple Mail cache files
- Large mailbox size
- Incorrect IMAP/SMTP settings
- Outdated macOS (including macOS 26 or other latest versions) or compatibility issues
- VPN or firewall interruptions
- Email server syncing issues
Fix Apple Mail Stuck on Downloading Messages Error Using Multiple Methods
1. Check Your Internet Connection
The first thing you should do is validate your internet connection. Apple Mail needs a stable connection to download emails properly.
- Open Safari or Chrome
- Visit any website
- Check whether pages are loading normally
- Restart your Wi-Fi router if needed
If the internet is unstable, Apple Mail may remain stuck on downloading messages indefinitely.
2. Force Quit and Reopen Apple Mail
Sometimes the Mail app freezes temporarily due to background syncing issues.
- Press Command + Option + Escape
- Select Mail
- Click Force Quit
- Reopen Apple Mail
This simple fix often resolves temporary download glitches.
3. Restart Your Mac or iPhone
A quick restart can refresh system services and remove temporary bugs affecting Apple Mail.
For Mac:
- Click the Apple logo
- Select Restart
For iPhone:
- Hold the power button
- Swipe to power off
- Restart the device after 30 seconds
Many users fix the “Mail app stuck downloading messages” problem with this method alone.
4. Rebuild Mailbox in Apple Mail
Corrupted mailbox indexes can also cause syncing problems.
- Open Apple Mail
- Select the problematic mailbox
- Click Mailbox
- Choose Rebuild
Apple Mail will re-download all emails from the server. This procedure may take some time depending on mailbox size.
5. Remove and Re-Add Your Email Account
If rebuilding doesn’t work, removing and adding the account again can help.
- Open System Settings
- Go to Internet Accounts
- Select your email account
- Remove the account
- Add it again using correct credentials
This refreshes the connection between Apple Mail and the email server.
6. Disable VPN or Firewall Temporarily
- VPNs and firewalls can interfere with Apple Mail synchronization.
- Try disabling them temporarily and then reopen Mail.
- If Apple Mail starts downloading messages normally afterward, your VPN or firewall settings may be blocking email ports.
7. Update macOS or iOS
Running an outdated operating system may cause compatibility issues with Mail servers.
Update macOS:
- Open System Settings
- Click General
- Select Software Update
Update iPhone:
- Open Settings
- Tap General
- Select Software Update
Installing the latest updates can fix Apple Mail bugs automatically.
8. Check IMAP Settings
Incorrect IMAP settings are one of the biggest reasons behind Apple Mail syncing problems.
- Incoming mail server
- Outgoing SMTP server
- Port numbers
- SSL settings
You can get the correct settings from your email provider’s website.
9. Clear Apple Mail Cache Files
Corrupted cache files can slow down or freeze the Mail app.
- Close Apple Mail
- Open Finder
- Go to: ~/Library/Mail/
- Locate cache-related files
- Move them to Trash
- Restart Mail
Apple Mail will recreate fresh cache files automatically.
10. Reduce Mailbox Size
A huge inbox with thousands of emails and attachments can slow down synchronization.
- Deleting unnecessary emails
- Emptying Trash and Spam folders
- Archiving old messages
This can significantly improve Mac Mail performance.
Additional Tip: Convert & Backup Apple Mail Data Professionally
Additionally, if your Apple Mail mailbox becomes corrupted or inaccessible, using a professional solution like MacMister Apple Mail Converter for Mac can help you safely backup, migrate, and manage your email data without any hassle. The tool offers multiple export options and allows users to convert Apple Mail to PST, PDF, MSG, MBOX, EML, HTML, TXT, DOC, IMAP, Office 365, Gmail, Thunderbird, and several other file formats. It also supports bulk email conversion, which helps save time when transferring large mailboxes.
During the conversion process, the Apple Mail Migrator Tool maintains the original folder hierarchy, email formatting, attachments, and metadata to ensure zero data loss. It is designed to provide a secure and smooth migration experience for users facing Apple Mail syncing or downloading issues. One of its useful features is the free demo version that lets users convert up to 25 items per folder before purchasing the full version. Another major advantage is that the tool supports both Mac and Windows operating systems.
Final Thoughts
The Apple Mail stuck on downloading messages issue can be frustrating, but it is usually fixable with simple troubleshooting steps like restarting the Mail app, checking internet connectivity, rebuilding the mailbox, re-adding the email account, or clearing cache files. If the problem still continues, it may be related to mailbox corruption or sync issues, where a tool like Mac Apple Mail Converter can help as an additional backup and recovery solution. With the right steps, Apple Mail can be restored to normal working condition without risking email loss.
FAQs on Mac Mail Stuck on Downloading Messages Issue
1. Why is Mac Mail stuck on downloading messages?
It usually happens due to poor internet, server sync issues, or corrupted mailbox data.
2. How do I fix Apple Mail not downloading emails on Mac?
Restart Mail, check internet, rebuild mailbox, or re-add your email account.
3. Does rebuilding mailbox fix syncing issues?
Yes, it helps fix sync issues by refreshing and re-downloading emails.
4. How can I stop Apple Mail from getting stuck again?
Keep macOS updated and maintain a stable internet connection.