Question 1

How do I send an email with attachments using EMail for Crystal?

Accepted Answer

Use the EMail::Message object's methods to add attachments, as referenced in the README under 'Email message'. You can attach files by calling specific attachment methods, and detailed examples are in the linked documentation.

Question 2

EMail for Crystal vs other Crystal email libraries like kemal-mail?

Accepted Answer

EMail for Crystal is a standalone library focused on SMTP sending with concurrency and TLS, while kemal-mail might integrate with the Kemal web framework. Choose EMail for Crystal for general-purpose email sending outside web contexts or if you need concurrent batch processing.

Question 3

How to set up STARTTLS with EMail for Crystal?

Accepted Answer

Configure the EMail::Client::Config object with the appropriate port (e.g., 587) and enable TLS settings. The README shows you need to ensure libssl is installed and use the config to specify TLS mode for secure connections.

Question 4

Is EMail for Crystal thread-safe for concurrent usage?

Accepted Answer

It supports concurrent sending through EMail::ConcurrentSender but uses a single-threaded model, so it's designed for concurrency within one thread. For multi-threaded applications, you may need to manage instances carefully to avoid conflicts.

Question 5

Can I use EMail for Crystal with Gmail's SMTP server?

Accepted Answer

Yes, configure the client with Gmail's SMTP server (e.g., smtp.gmail.com on port 587 with STARTTLS) and enable SMTP AUTH with your credentials. The library supports AUTH PLAIN and LOGIN as per the features list.

Question 6

How to debug SMTP connection issues in EMail for Crystal?

Accepted Answer

Enable debug logging by setting the log level to Debug, which outputs all SMTP commands and responses. However, be cautious as debug logs may contain Base64-encoded sensitive information like passwords, so use it only in secure environments.

Question 7

Does EMail for Crystal support email bounce handling or retries?

Accepted Answer

No, the library focuses on sending emails via SMTP and does not include built-in features for handling bounces or automatic retries. You would need to implement such logic externally, such as monitoring SMTP responses or using external services.

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