Mac Mail Not Sending Emails: A Comprehensive Guide to Troubleshooting and Solutions

Struggling with Mac Mail not sending emails? Our guide offers troubleshooting tips and solutions you need.

Mac Mail Not Sending Emails: A Comprehensive Guide to Troubleshooting and Solutions

The ability to send emails is a fundamental feature of any email client, and Mac Mail is no exception. When this function fails, it can disrupt both personal and professional communication. This article aims to provide a comprehensive guide to understanding, diagnosing, and solving the issue of Mac Mail not sending emails.

Understanding the Issue

How Mac Mail Handles Outgoing Emails

Mac Mail uses the Simple Mail Transfer Protocol (SMTP) to handle outgoing emails. This protocol is responsible for delivering your emails to the recipient’s email server. Understanding how SMTP works can provide insights into why you might be experiencing issues with sending emails.

Common Errors and Symptoms

Users often report issues like emails stuck in the outbox, error messages indicating a failure to connect to the SMTP server, or even the complete inability to send emails. These symptoms usually point to an underlying issue that needs to be addressed.

Common Causes

Incorrect SMTP Settings

One of the most frequent causes of sending issues in Mac Mail is incorrect SMTP settings. These settings define how Mac Mail interacts with your email provider’s server to send emails. Incorrect server addresses, port numbers, or security protocols can prevent emails from being sent.

Internet Connectivity Issues

A stable internet connection is crucial for sending emails. If you’re experiencing issues with Mac Mail not sending emails, it’s worth checking whether your internet connection is stable and fast enough to handle email traffic.

Software Conflicts

Third-party software, especially security applications or other email management tools, can sometimes interfere with Mac Mail. These conflicts can prevent the application from connecting to the SMTP server, thus disrupting the email sending process.

Advanced Troubleshooting

Using Connection Doctor

Mac Mail comes with a built-in feature called Connection Doctor that can diagnose issues with your email accounts. This tool provides real-time information about your connection to the incoming and outgoing servers, helping you pinpoint any issues that might be preventing emails from being sent.

Firewall and Security Settings

Firewalls and security software can sometimes block certain network ports used for sending emails. Ensuring that ports 25, 465, or 587 are open in your firewall settings can often resolve issues with sending emails.

Solutions and Fixes

Basic Troubleshooting Steps

The first steps in resolving sending issues in Mac Mail include restarting the application and verifying your SMTP settings. These simple steps can often resolve minor issues that might be preventing emails from being sent.

Advanced Solutions

For more complex issues, you may need to delve into advanced SMTP settings or even use Terminal commands to reset network settings. These steps are more technical and should be taken with caution.

Expert Solutions

If you’ve tried all the above steps and still can’t send emails, it might be time to seek professional help. Apple Support offers a range of services to help resolve complex issues, and there are also third-party experts who specialize in Mac troubleshooting.


Being unable to send emails can be a frustrating experience, but understanding the common causes and solutions can help you resolve this issue quickly. With the right troubleshooting steps, you can get your Mac Mail back up and running, ensuring seamless communication for both personal and professional needs.


  1. If you can’t send or receive email on your Mac – Apple Support
  2. Can’t Send Email in Apple Mail? Here’s How to Fix It – Lifewire
  3. Can’t send outgoing messages in Mac Mail – Ask Different – Apple StackExchange

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