What is the best email delivery option when a client wants control over mail logs for independent investigation of email bounces?

Choosing SMTP Relay is the most effective email delivery option for a client seeking control over mail logs to independently investigate email bounces. SMTP Relay services provide detailed logs and reporting functionalities, allowing clients to track the status of their emails meticulously. This includes bounce notifications, delivery confirmations, and other critical metrics that can help diagnose issues regarding mail delivery.

With SMTP Relay, clients can manage their own email server settings and regulations, thereby gaining insight into each email sent, the reasons for any bounces, and potential issues with recipient email servers. This level of control is crucial for performing in-depth investigations into email deliverability problems.

In contrast, other methods such as API Integration or Standard Email might not provide the same level of logging detail and control. API integrations can facilitate sending and tracking emails but often depend on third-party processing, which may limit access to detailed logs. Direct Mail Server setups could offer some logging capabilities, but typically not as comprehensively or flexibly as SMTP Relay solutions do. Therefore, for thorough investigation and control over email bounces, SMTP Relay stands out as the best option.