[issue43949] binascii.Error raised in smtplib when initial_response_ok=False

[Pandu E POLUAN]

Pandu E POLUAN <pepoluan at gmail.com> added the comment:

A stronger case is the "Formal Syntax" on https://tools.ietf.org/html/rfc4954#page-13 :

>       continue-req    = "334" SP [base64] CRLF
>                         ;; Intermediate response to the AUTH
>                         ;; command.
>                         ;; This non-terminal complies with
>                         ;; syntax defined by Reply-line [SMTP].

Nothing else besides base64 is allowed; after "334 " it MUST be either <base64> or <nothing>.

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