`type t`````
`include sig ... end`
`val sexp_of_t : t ‑> Base.Sexp.t`
`val create : string ‑> t`

Creates a boundary from the value of the "boundary" parameter in a Content-type header (RFC2046, p.19) Alias of to_string.

`val split : t ‑> Email_message.Bigstring_shared.t ‑> Email_message.Bigstring_shared.t option * Email_message.Bigstring_shared.t list * Email_message.Bigstring_shared.t option`

Splits an multipart body into a list of messages, and, if there are, an optional prologue and epilogue.

`val join : t ‑> (Email_message.Bigstring_shared.t option * Email_message.String_monoid.t list * Email_message.Bigstring_shared.t option) ‑> Email_message.String_monoid.t`
`val generate : ?⁠text:Email_message.Bigstring_shared.t ‑> ?⁠suggest:t ‑> unit ‑> t`

Creates valid boundaries for given text.

Open an close boundaries

`module Open : Email_message__.String_monoidable.S with type t := t`

Used when the boundary indicates a new part

`module Close : Email_message__.String_monoidable.S with type t := t`

Used when the boundary indicates that there are no more parts

`module Open_first : Email_message__.String_monoidable.S with type t := t`

Used when the boundary indicates the beginning of the first part of the message, and there is no prologue.

`include Core.Stringable.S with type t := t`
`type t`````
`val of_string : string ‑> t`
`val to_string : t ‑> string`
`module Stable : sig ... end`