Question 1

How to send an email with attachments using mail-send?

Accepted Answer

Use the MessageBuilder's .attachment() method with MIME type and data, as shown in the DKIM signing example. It automatically handles MIME encoding for optimal delivery.

Question 2

mail-send vs lettre for Rust email sending?

Accepted Answer

mail-send focuses on RFC compliance and security with built-in DKIM, while lettre offers broader features like email parsing. Choose mail-send for secure sending; lettre if you need parsing too.

Question 3

Does mail-send support OAuth2 for Gmail authentication?

Accepted Answer

Yes, it supports XOAUTH2 for Google services as part of its automatic SMTP authentication negotiation, making it easy to integrate with Gmail or Google Workspace.

Question 4

How to implement DKIM signing with mail-send?

Accepted Answer

Create a DkimSigner with your private key, domain, and selector, then use .send_signed() in SmtpClientBuilder, as demonstrated in the README's second example.

Question 5

Is mail-send async-only, or can I use it synchronously?

Accepted Answer

It's async-first and requires Tokio; there's no built-in synchronous API. You'd need to run it in an async context or use blocking wrappers if available.

Question 6

What MIME types does mail-send support for attachments?

Accepted Answer

It supports full MIME standards (RFC 2045-2049) with automatic encoding, so any MIME type can be specified via the .attachment() method, like 'image/png' or 'application/pdf'.

Question 7

Can mail-send handle large email volumes efficiently?

Accepted Answer

Yes, its async design with Tokio allows for non-blocking operations, making it suitable for high-volume sending, though performance depends on SMTP server and network conditions.

mail-send

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