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mime/quotedprintable: accept LWSP-char after =
SP and HTAB are allowed after a = before the following CRLF. RFC 2045 section 6.7 describes the ABNF for the quoted-printable encoding: qp-line := *(qp-segment transport-padding CRLF) qp-part transport-padding qp-segment := qp-section *(SPACE / TAB) "=" transport-padding := *LWSP-char ; Composers MUST NOT generate ; non-zero length transport ; padding, but receivers MUST ; be able to handle padding ; added by message transports. RFC 822 defines LWSP-char as: LWSP-char = SPACE / HTAB Dovecot's imaptest contains such a message in src/tests/fetch-binary-mime-qp.mbox.
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