🚨 PREREQUISITE: Core module tests must pass first
SENDGRID_API_KEY)SENDER_EMAIL)SENDGRID_API_KEY is valid and not expiredSENDER_EMAIL is verified with SendGridAPI Key Validation
Configuration Security
EmailService::new() → Successsend_simple() → SuccessTemplateEmail with test datasend_template() → SuccessInvalid API Key Handling
EmailError::InvalidApiKeyNetwork Error Handling
EmailError::NetworkErrorEmailError::InvalidEmailAddressTemplateEmail with all required fieldsfrom, to, subject, template_id set correctlyvariables HashMap populatedVendor Interest Email Workflow
send_copy=true)after_save hook triggeredVendor Interest Email Error Handling
LOI Email Workflow
Email Verification Workflow
SendGrid Service Outage
API Quota Exhaustion