MX18 Best Practices – Use REST API for high-volume sending, retry on errors, batch smartly, and optimize message size (<100KB body, <20MB total) for top performance.

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MX18 Attachments – Include PDFs, images, CSV via API (base64) or SMTP (MIME); supported formats, 20 MB limit, billing units, and helpful best practices.

MX18 Personalisation – Use recipient-level and global placeholders to dynamically customize emails per recipient or fallback.

MX18 Error Handling – Learn how to handle HTTP status codes (400, 401, 422, 500, etc.) and MX-specific codes (MX-0001 to MX-0008) for structured responses.

MX18 Send via SMTP – Set up smtp.mx18.com with TLS (port 587), use your API token as password, verify sender. Also includes Telnet testing and error codes.

MX18 Send via API – Learn how to send your first email via API with JSON POST. Includes prerequisites, endpoint, request payload, sample response, and field reference.

MX18 Authentication – Secure email delivery via API or SMTP using automatically generated API tokens. View or regenerate tokens in Settings > API Keys.

MX18 Getting Started — Sign in, verify your sender, choose REST API or SMTP, and monitor email activity. Start sending emails with ease and confidence.