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Method 1: Number of SMTPs = Number of Emails × Number of IPs In this method, each combination of an email and an IP address creates a unique SMTP interface. Formula: Number of SMTPs = Number of Emails × Number of IPs Example: Emails: 3 IPs: 4 Total SMTP Interfaces: 3 × 4 = 12 SMTP Interfaces This method is useful when you want to maximize the use of your available IPs for better deliverability and load balancing. Method 2: One Email Per IP = One SMTP Interface In this method, each IP address is associated with a single email to create one SMTP interface. Example: Emails: 6 IPs: 6 Total SMTP Interfaces: 6 SMTP Interfaces This is a simpler and more straightforward method, ideal if you prefer a one-to-one email-to-IP relationship for more controlled email management. Additional Configuration Options When configuring SMTP interfaces, you can also add the following optional parameters for better control: use-unencrypted-plain-auth: Allow plain authentication without encryption. use-starttls: Enable STARTTLS for secure email transmission. require-starttls: Force the use of STARTTLS for a secure connection. max-smtp-out: Set a limit on the number of outgoing SMTP connections. Example with Additional Options: email@example.com password host port use-unencrypted-plain-auth use-starttls require-starttls max-smtp-out Example with Only Required Options: email@example.com password host port These four parameters (email, password, host, port) are mandatory for the SMTP setup.