Fix POSIX 61 Error Apple Mail on Mac: 2026 Complete Guide

Resolve POSIX 61 Error Apple Mail

The error code POSIX 61 refers to “Connection Server Refused”. It occurs on all your Mac, iPhone, iPad, while trying to connect with the server, but is blocked by the network. It isn’t any random glitch and can interrupt the entire operations on your Apple Mail. Here, the Mac Mail tries to connect with the incoming IMAP and outgoing SMTP servers, but the request is rejected, and the connection fails. 

Symptoms Found Due to POSIX 61 Error 

When this error is encountered, you may find the following issues:

• Message failures-unable to send 
• Mails stuck in the Outbox 
• Sync issues and connection timeouts 
• Repetitive account authentication 
• Apple Mail shows “Cannot Connect” errors 
• Frequent SMTP authentication errors 
• Missed communications between teams and clients
• Delayed investigations, approvals, and responses 

Common Causes of the Mac Mail Error 

The significant reasons why the POSIX 61 Error Apple Mail arises are:

• Incorrect server settings, particularly SMTP
• Temporary downtime in the email server availability 
• Blocked emails for communication due to firewall/security settings 
• Duplicacy because of several connections to the same mailbox 
• Damaged or corrupted configuration files interrupting communications
• Unstable network connectivity can create conflicts and thus, errors 

How to Fix POSIX 61 Error Apple Mail on Mac?

There are a few manual workarounds you can follow to resolve this Mac Mail error. However, ensure that if nothing seems to work, try accessing your data via Mac Mail MBOX File Converter and prepare a backup for the same. Follow the step-by-step guide as mentioned in this section. 

Troubleshoot & Fix Error POSIX in Apple Mail

Follow the guide given here to resolve the Apple configurator network issue and get access to the emails:

1) Check and Reset Mail Server Settings 

1. Initially, open the Mail Server on the web and connect with your email provider to verify server uptime. 
2. Then, go to Apple Mail and click on Settings. Next, move to Accounts.
3. Tap Server Settings and check all the Incoming, Outgoing, Port, and SSL Settings. 
4. Compare the settings with the official recommendations to make sure nothing is wrong. 

2) Disable Security or Switch Network 

1. Open the macOS Firewall Settings. Disable it temporarily. 
2. Test your Apple Mail and add it as an exception. 
3. Also, try to connect with a different network and use a mobile hotspot to connect. 
4. Confirm that your ISP doesn’t block the ports during mail transfer. 

3) Use Terminal to Fix 

1. Open a terminal and run the given command to flush DNS cache:

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

2. It will resolve any DNS-related connectivity issues and fix Apple Mail not receiving emails. 
3. Again, test your server connectivity with the command:

telnet mail.server.com 587

4) Reset Preferences and Rebuild Mailbox 

1. Start by closing Apple Mail and then go to ~/Library/Preferences/. 
2. Find and identify the Mail Preference files. Remove them. 
3. Restart your Apple Mail and choose the corrupted mailbox. 
4. Tap Mailbox and finally, Rebuild for the fix. Refresh the mailbox and complete sync. 

5) Eliminate Duplicate Mail Copies

1. Open the System Settings and go to the Internet Accounts. 
2. Further, review configured Mail accounts and identify duplicates. 
3. Remove the unnecessary Mail copies, restart Apple Mail, and test again. 

6) Delete and Re-Add Apple Mail Account 

1. First, start Apple Mail and delete your existing account. 
2. Then, restart Apple Mail and add the account with the correct credentials. 
3. Ensure your emails are synced with the server before deletion. 
4. Later, backup your mailboxes too, if really necessary. 

Quick & Scalable Fix POSIX 61 Error Apple Mail on Mac

If none of the above manual methods can help you fix Mac Mail error while moving messages, then use SysInfo Apple Mail MBOX Exporter. This ultimate utility allows you to sync all the Apple Mail emails fetched via an active profile on the Mac OS or MBOX files and restore them in multiple formats or email clients securely with zero loss. You can manage data effectively and ensure that every email and folder is kept intact with 100% accuracy and precision. 

Steps to Backup Emails via MBOX Converter:

1. Launch the Apple Mail Converter and tap the Continue button. 
   
   
2. Then, select your Apple Mail profile on Mac or upload MBOX files. Tap Proceed. 
   
   
3. Further, check the contents within your email, select folders, and hit Proceed. 
   
   
4. Pick where you want to export your Apple Mail data and use the filters. 
   
5. Finally, pick a destination via Browse to restore and click Start Export. 
   

Note: You can use the iCloud Mail Backup Tool if your Apple Mail syncs emails with iCloud, but only for the official accounts created with @icloud.com, @me.com, or @mac.com. 

Ideal Practices Must Follow to Prevent Error POSIX 61 

In order to prevent this Apple Mail error in the future, ensure you fulfill these:

• Keep your macOS updated and verify the SMTP settings 
• Remove unused Apple Mail accounts or duplicate emails 
• Maintain a stable network connection and use secure authentication 
• Don’t use public or restricted networks for email access
• Opt for trusted firewall and antivirus software with proper configurations

Wrapping Up 

Error code POSIX 61 in your Apple Mail may seem like a complex issue, but it is just a technical problem due to network connectivity issues. With proper measures and troubleshooting, you can easily resolve the error. If the native solutions don’t work to fix POSIX 61 Error Apple Mail on Mac, then you can use the professional SysInfo MBOX Exporter to maintain a data backup and securely access emails across platforms. You can even avail the One-Time Service to experience a no software installation data management, or for any concerns, reach out to the technical support 24/7.

Frequently Asked Questions

About The Author:

Simran Bhatia

Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms.