Header encoding when Initializing from a hash

[flop]

I'm not sure if I'm doing something wrong or if it's a problem with the gem. When I'm trying to create an email with at least 2 recipient with utf8 characters from a Hash I get different encoding for the To header. And doing so, the smtp refuse to send my email with "501 5.1.3 Bad recipient address syntax".

Classical Init (works great):

1.9.3p374 :001 > m = Mail::Message.new
#<Mail::Message:19456400, Multipart: false, Headers: >
1.9.3p374 :002 > m.to = ['äää <aaa@test.com>', 'äbä <aba@test.com>']
[
    [0] "äää <aaa@test.com>",
    [1] "äbä <aba@test.com>"
]
1.9.3p374 :003 > m[:to].encoded
"To: =?UTF-8?B?w6TDpMOk?= <aaa@test.com>, \r\n =?UTF-8?B?w6Riw6Q=?= <aba@test.com>\r\n"

Init from a hash (rejected by smtp server with "501 5.1.3 Bad recipient address syntax"):

1.9.3p374 :004 > m2 = Mail::Message.new({:to => ['äää <aaa@test.com>', 'äbä <aba@test.com>']})
#<Mail::Message:20692240, Multipart: false, Headers: <to: äää <aaa@test.com>, äbä <aba@test.com>>>
1.9.3p374 :005 > m2[:to].encoded
"to: =?UTF-8?Q?=C3=A4=C3=A4=C3=A4_<aaa@test.com>,_=C3=A4b=C3=A4_<aba@t?=\r\n =?UTF-8?Q?est.com>?=\r\n"

I was expecting the same behaviour when creating an email from hash but it's not. Is this a bug or I should not use the initialize with a hash ?

[jeremy]

Fixed by #1103. This is due to having a To address that couldn't be parsed, leading to encoding the entire address and passing that through as the SMTP sender, leading to the error above.