io-smtp 0.2.2

SMTP client library for Rust
Documentation 
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//! DSN EHLO capability (RFC 3461 ยง4).

/// EHLO capability keyword for Delivery Status Notifications.
///
/// Use with `SmtpEhloResponse::has_capability(DSN)` to check whether the
/// server supports the DSN ESMTP parameters on MAIL FROM and RCPT TO.
pub const DSN: &str = "DSN";