Mac Mail – Cannot Send Message Using the server Carrie SmahaUpdated on August 16, 2021 1 Minute Read Email Client: Mac Mail Error Message: Cannot send message using the SMTP server Solution: You will need to update the SMTP server settings – most likely you’re dealing with a port 25 blocking issue. If you are using a SSL on your site you can use the SSL port 465. Make sure the box to use SSL is checked. If not, you can use port 587 and leave the box unchecked. The correct ports are below: Non-SSL outgoing SMTP: 587 SSL enabled outgoing SMTP: 465 Summarize and Research with AIShare on Social Media Carrie Smaha Senior Manager Marketing Operations Carrie Smaha is a digital strategy, web development, and SEO leader with 20 years of experience. She built her foundation in fast-paced agency environments before moving in-house to InMotion Hosting, where she leads go-to-market programs, agency initiatives, and technical product marketing that connects product capability to real customer decisions. More Articles by Carrie Related Articles How to Find Your Email Settings in cPanel or Webmail How to Allow or Block a Country in WHM with cPHulk or CSF Transferring Emails from Your Old Host to InMotion Hosting How to Block Spam Email in cPanel and Strengthen Email Authentication How to Back Up Email Using Thunderbird Mail Delivery Failed: Returning Message to Sender How to Use InMotion Email with Gmail (2026 Update) SPF, DKIM, DMARC, PTR, and BIMI Records: Complete Setup Guide SMTP and ESMTP Error Code List Common Email Error Messages
