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fix(mime): Q-encode RFC822 specials in header words #76

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fix(mime): Q-encode RFC822 specials in header words #76

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8 changes: 7 additions & 1 deletion sope-mime/NGMime/NGMimeHeaderFieldGenerator.m
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,13 @@

static BOOL isPrintable(char ch) {
// match printable ASCII-characters according to https://tools.ietf.org/html/rfc2047#section-4.2
return ch >= 32 && ch < 127 && ch != '=' && ch != '?' && ch != '_' && ch != '.' && ch != ',' && ch != ';' && ch != ':' && ch != '@' && ch != '"';
// RFC 822 `specials` (`()<>[]:;@\,.")` must also be Q-encoded: a literal `[Org]`
// inside an encoded word breaks Dovecot's rfc822 parser, which then fabricates
// a recipient like `Name @MISSING_DOMAIN` (mailbox truncated at `[`, domain lost).
return ch >= 32 && ch < 127 && ch != '=' && ch != '?' && ch != '_'
&& ch != '(' && ch != ')' && ch != '<' && ch != '>'
&& ch != '[' && ch != ']' && ch != '\\'
&& ch != '.' && ch != ',' && ch != ';' && ch != ':' && ch != '@' && ch != '"';
}

@implementation NGMimeHeaderFieldGenerator
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