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MX18 IP Address – Understand shared vs dedicated IPs, deliverability impact, blocklisting policy, and best practices for sender reputation control.

MX18 Link Branding – Point your subdomain (e.g., mail.yourdomain.com) via CNAME to trk.mx18.io for trusted, branded tracking links and improved deliverability.

MX18 Domain Authentication – Secure your emails by configuring SPF, DKIM & DMARC. Update DNS, verify propagation, and improve deliverability.

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.

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. Including Telnet testing and error codes.

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