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Use a secret key client for all email methods.

Send with basic HTML (emails->send)

Send to multiple recipients

to supports strings, recipient objects, or both:

Send with template and data

Send with attachments

Attachment content should be Base64-encoded:

Send with advanced options

Handle typo suggestions

For bulk validation, credits, and ledger examples, see PHP Email Validation. See full endpoint details in the Send email API reference and Email Validation API reference.