v1.3.0

Bug Fixes

• Fixed data race in test suite when accessing mock SMTP server messages
• Fixed pool.Close() race condition that could cause a panic on concurrent use
• Fixed releaseConnection panicking when writing to a closed channel
• Fixed SetRateLimit leaking goroutines when called multiple times

Improvements

• Added Close() method to Mail for explicit resource cleanup (pool connections and rate limiter)
• Email validation regex is now compiled once at package level instead of on every call

v1.2.0

Features

• SMTP protocol support
• Connection pooling for performance optimization
• HTML template support with custom functions
• File attachments (regular and streaming)
• Asynchronous email sending
• Rate limiting
• TLS support (STARTTLS and Direct TLS)
• CC and BCC recipients
• Email preview
• Configurable timeouts and keep-alive
• Template caching
• Comprehensive error handling

v1.0.0

sending smtp mail with go standard library