Ensure Email Marketing Custom Domain SSL for Deliverability
Your email marketing deliverability depends on secure sending practices. Monitor custom sending and tracking domains to prevent SSL expirations that can flag your emails as insecure, impacting open rates and brand reputation.
The problem
Email marketing relies heavily on trust and deliverability, both of which are severely impacted by insecure custom domains. If your custom sending domain or the tracking domains used for link opens and clicks have an expired SSL certificate, email clients and corporate firewalls are more likely to flag your messages as suspicious or outright block them. This leads to significantly lower open rates, higher bounce rates, and a damaged sender reputation within platforms like Mailchimp, Klaviyo, or HubSpot, directly hurting your campaign ROI.
The subtle but critical role of SSL on email-related domains is often overlooked until deliverability metrics plummet. An expired certificate on a link within your email could lead recipients to a "Not Secure" warning page, instantly eroding trust and making them less likely to engage with future communications. This not only wastes the effort put into crafting compelling campaigns but also signals to ISPs that your brand might be less legitimate, making it harder to reach inboxes even for subsequent, properly secured emails.