Enum Protocol 

#[non_exhaustive]
pub enum Protocol {
    Smtp,
    Lmtp,
}

Transport protocol for the connection.

Determines the greeting command and DATA response handling. SMTP uses EHLO and returns one reply after DATA (RFC 5321 Section 3.1). LMTP uses LHLO and returns one reply per recipient after DATA (RFC 2033 Section 4.2).

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.

Smtp

Standard SMTP (RFC 5321). Uses EHLO; one reply after DATA.

Lmtp

Local Mail Transfer Protocol (RFC 2033). Uses LHLO; one reply per recipient after DATA.

Trait Implementations

impl Clone for Protocol

fn clone(&self) -> Protocol

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Protocol

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

Formats the value using the given formatter.

impl Hash for Protocol

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Protocol

fn eq(&self, other: &Protocol) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Protocol

impl Eq for Protocol

impl StructuralPartialEq for Protocol