Why are emails not sending on Mac?
Mia Morrison
Updated on March 15, 2026
Why are emails not sending on Mac?
Make sure the outgoing (SMTP) mail server is specified as directed by the provider of your email account. See Verify an email account’s outgoing server. Choose Window > Connection Doctor, then follow the instructions displayed in the Details column.
Why is my Cox email not sending?
For your protection, any devices or email client programs using outdated port settings with your Cox Email address are unable to send email until you’ve updated to secure settings. As a result, you may need to update email clients or other devices using your Cox Email account.
How do I fix my outgoing mail server on my Mac?
To change these preferences in the Mail app on your Mac, choose Mail > Preferences, click Accounts, click Server Settings, click the outgoing Account pop-up menu, then choose Edit SMTP Server List. The servers available to you and the accounts that are using them. Add or remove a server.
What are the SMTP settings for Cox net?
Email Settings for COX
- Incoming Server. Account Type: IMAP. Incoming Server: imap.cox.net. Port: 993.
- Outgoing Server. Server Name: smtp.cox.net. Port: 465. User Name: [username]@cox.net.
- Incoming Server. Account Type: POP. Incoming Server: pop.cox.net. Port: 995.
- Outgoing Server. Server Name: smtp.cox.net. Port: 465.
Why is mail stuck in outbox on Mac?
The Outbox in Apple’s Mac Mail appears only when an email you are trying to send is not able to be sent. This is usually due to one of two situations: You are working in offline mode; or this is a connection problem. The Outbook will disappear once the mail is sent.
Can receive mail but Cannot send?
This error usually indicates the failure of your email program to connect to port 25, the SMTP (outgoing mail) port. One of the following is the likely cause of this problem: Your firewall blocks SMTP connections to an internet mail server.
How do I setup my Cox email on my Mac?
1 Add Cox Account to macOS
- Select the Apple menu, then select System Preferences.
- Select Internet Accounts, then select Add Other Account.
- Select Mail account.
- Enter Your Name, your Email Address, and Password, then select Sign In.
- You may now launch the Mail program from your Dock or Applications to check your email.
Is Cox net POP or IMAP?
Cox.net (Cox) provides IMAP access to your Cox.net (Cox) account, so you can connect to your email from mobile devices and desktop email clients.
Why is my mail stuck in the outbox on my Mac?
Can receive email but Cannot send?
This error usually indicates the failure of your email program to connect to port 25, the SMTP (outgoing mail) port. Your firewall blocks SMTP connections to an internet mail server. Consult your firewall documentation or network administrator for details.
Is Cox a POP or IMAP?
Why can I receive email but not send?
If you can receive emails but can not send emails this usually means the authenication required by the outgoing (SMTP) server is not configured. ‘My outgoing (SMTP) server requires authentication’ is not checked. In Outlook it is in advanced settings.