How to Fix POSIX 61 Error Apple Mail Safely? Top 10 Methods

Mark Regan
Published: April 15th, 2026 • 5 Min Read

POSIX 61 error Apple Mail is one such frustrating issue faced by multiple macOS users. Email communication is the backbone of both personal and professional workflows nowadays, and when it suddenly stops working it can disrupt everything.

This POSIX 61 error Apple Mail typically appears when trying to send and receive emails and indicates that your Mail app is unable to connect to the server. The message may look technical and confusing, but it’s just a network error POSIX 61 Apple Mail.

In this blog, we are going to discuss what does network error POSIX 61 mean, how does it affects the workflow and best ways to fix it.

What Does Network Error POSIX 61 Mean?

Network error POSIX 61 mail points out a connection to the server failed, typically appearing in the Apple Mail app while using the iPhone or Mac system. When it cannot reach the email server, it often results from VPN usage, strict security settings, or issues with the iOS 18 updates.

Sometimes, it may appear in synonyms such as “Connection Refused”, “Cannot Get Mail – The connection to the server failed”, IMAP/POP error. Now that you understand this error, let us discuss some major causes so that it becomes easier to fix.

Root Causes of POSIX 61 Error Apple Mail

Sometimes, active VPNs, network restrictions, or incorrect account settings are the causes of this issue. Let us talk about them briefly:

Active VPNs or security apps blocking connections are among the most common causes of this issue.
Sometimes restricted Wi-Fi networks may block the IMAP/POP3 traffic and cause trouble.
An unstable or poor internet connection, or server issues, are common reasons behind POSIX 61 error Apple Mail app.
Incorrect SMTP/IMAP settings and authentication methods or misconfigured settings cause the issue.
iOS Bugs are known to appear after updating, especially around iOS 18.2.

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How to Fix POSIX 61 Error Apple Mail?

There are multiple fixes based on the cause of the network error POSIX 61 Apple Mail, let us talk about them:

Method 1: Check Internet Connection

First, make sure to have a proper internet connection.
Now, switch between Wi-Fi and mobile hotspot to test.
After that, restart your router.

Method 2: Verify Mail Server Settings

Sometimes, incorrect settings create the issue and below are the steps to resolve it:

First, open Mail >> Settings (Preference).
Now, go to Accounts.
Select your email account.
Check for IMAP/POP, SMTP, Port numbers and Username & password.

Method 3: Change SMTP Port

Sometimes default ports are blocked and users face POSIX 61 error Apple Mail. Try some common SMTP ports such as 587 (recommended), 465 (SSL), Avoid port 25 (often blocked).

Method 4: Disable Firewall or Antivirus Temporarily

Security tools may block the connection and you can disable them temporarily:

First, go to the System Settings >> Network >> Firewall.
Temporarily disable it.
Or allows Mail app through firewall.

If this method fixes your issue, add Mail as an exception.

Method 5: Rebuild Mailbox

When the mailbox gets corrupted, rebuilding it can solve multiple other mailbox related issues along with it.

First, open Apple Mail app.
Now, select the mailbox.
After that, click on Mailbox >> Rebuild.

This way the mailbox gets refreshed and fixes all the sync related issues.

Method 6: Remove and Re-add Email Account

Go to the Mail >> Settings >> Accounts.
Now, remove the account.
Restart your Mac machine.
Now, add your account again to reset all the configurations.

Method 7: Check Email Provider Status

Sometimes, the issue lies in the network services. Visit your email provider status page. check if the server is doing good or down. Wait until the issue gets resolved.

Method 8: Update macOS and Apple Mail

Outdated software can cause the compatibility issue, to get rid of it:

Go to the System Settings >> General >> Software Update.
After that install the latest version of the software.

Method 9: Test Connection Using Another Device

If you are unable to access your email, try switching across Apple devices and browsers.

Method 10: Check SSL Settings

Ensure proper encryption and for that, enable Use SSL and verify the correct authentication method through password or OAuth.

Some Considerable Tips to Avoid POSIX 61 Error Apple Mail Issue

Make sure to use the recommended mail server settings.
Try to avoid public or unsecured networks.
Remember to keep your macOS system always updated.
Verify your account credentials regularly.
Use a trusted and reliable antivirus tool with proper configuration.

It’s Time to Conclude

To fix the POSIX 61 error Apple Mail issue, we have discussed multiple methods related to a large number of reasons. If this manual method does not fix network error POSIX 61 Apple Mail, try BitRecover Apple Mail converter tool to transform your entire data into a more compatible format.

Additionally, if you have any other doubts or are facing issues related to other errors in the Apple Mail app across Apple devices, you can get in touch with our Technical Support team anytime. Our team of experts are available 24/7 to guide and assist you.