Don't Send Email From Domains You Don't Control

Developers frequently encounter the challenge of sending emails on behalf of their clients, especially in B2B applications, where the service provider wants the emails to appear as though they are coming from the client's domain. Historically, this was achieved by setting the "from" address to the client's email, but this practice is becoming obsolete due to security measures like DMARC, which combats phishing by ensuring emails are sent from authorized domains. As major email providers like Google, Microsoft, and Yahoo tighten their policies, emails sent from domains without proper authorization will no longer be delivered. To adapt, service providers can either guide clients in updating their DNS records with SPF and DKIM or offer DNS services themselves to manage these updates directly. Despite the added support overhead, these steps are necessary to maintain high email delivery rates, especially as email platforms increasingly enforce domain control for outgoing messages.

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