Ignore space between two encoded words (as per RFC 2047)

lib/mail/parsers/rfc_2822.ex

@@ -377,6 +377,9 @@ defmodule Mail.Parsers.RFC2822 do
  Mail.Encoders.Base64.decode(encoded_string)
  end
 
+ # Remove space if immediately followed by another encoded word string
+ remainder = Regex.replace(~r/\s+\=\?/, remainder, "=?")
+
  decoded_string <> parse_encoded_word(remainder)
 
  _ ->

test/mail/parsers/rfc_2822_test.exs

@@ -490,6 +490,19 @@ defmodule Mail.Parsers.RFC2822Test do
  assert message.headers["x-reallylongheadernamethatcausesbodytowrap"] == "BodyOnNewLine"
  end
 
+ test "parse header with folded encoded word" do
+ # This is seen in the examples in https://www.rfc-editor.org/rfc/rfc2047.html#section-8
+ message =
+ parse_email("""
+ X-Encoded-Word: =?utf-8?Q?h=CE=B5=C5=82=C5=82=C3=B8=20w=C3=B8?=
+ =?utf-8?Q?r=C5=82d?=
+
+ Body
+ """)
+
+ assert message.headers["x-encoded-word"] == "hεłłø wørłd"
+ end
+
  test "allow empty body (RFC2822 §3.5)" do
  message =
  parse_email("""