Enum vsmtp_protocol::Verb

#[non_exhaustive]
pub enum Verb {
    Helo,
    Ehlo,
    MailFrom,
    RcptTo,
    Data,
    Quit,
    Rset,
    Help,
    Noop,
    StartTls,
    Auth,
    Unknown,
}

SMTP Command.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Helo

Used to identify the SMTP client to the SMTP server. (historical)

Ehlo

Used to identify the SMTP client to the SMTP server and request smtp extensions.

MailFrom

This command is used to initiate a mail transaction in which the mail data is delivered to an SMTP server that may, in turn, deliver it to one or more mailboxes or pass it on to another system (possibly using SMTP).

RcptTo

This command is used to identify an individual recipient of the mail data; multiple recipients are specified by multiple uses of this command.

Data

This command causes the mail data to be appended to the mail data buffer.

Quit

This command specifies that the receiver MUST send a “221 OK” reply, and then close the transmission channel.

Rset

This command specifies that the current mail transaction will be aborted. Any stored sender, recipients, and mail data MUST be discarded, and all buffers and state tables cleared.

Help

This command causes the server to send helpful information to the client. The command MAY take an argument (e.g., any command name) and return more specific information as a response.

Noop

This command does not affect any parameters or previously entered commands.

StartTls

See “Transport Layer Security” https://datatracker.ietf.org/doc/html/rfc3207

Auth

Authentication with SASL protocol https://datatracker.ietf.org/doc/html/rfc4954

Unknown

Any other buffer received while expecting a command is considered an unknown.

Trait Implementations

impl AsRef<str> for Verb

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Debug for Verb

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FromStr for Verb

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Verb, <Self as FromStr>::Err>

Parses a string s to return a value of this type.

impl TryFrom<&str> for Verb

type Error = ParseError

The type returned in the event of a conversion error.

fn try_from(s: &str) -> Result<Verb, <Self as TryFrom<&str>>::Error>

Performs the conversion.

impl VariantNames for Verb

const VARIANTS: &'static [&'static str] = _

Names of the variants of this enum