Issues with iOS Mail app

[xMonty]

Hi,
if i send mail using iphone mail app (attached with gmail) and i just send an inline image along with text "sent from iphone"
i am getting error
Error: no binary decoder found for [7bit].
the image is not displayed the text part is displayed

the mime message looks something like this

`Return-Path:
X-Original-To:
Delivered-To:
Received:
Received:
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
..
..
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:content-transfer-encoding:from:mime-version:date
:subject:message-id:to;
..
..

X-Gm-Message-State: ...
X-Google-Smtp-Source: ...
X-Received:
Received:
Content-Type: multipart/mixed;
boundary="Apple-Mail-----------"
Content-Transfer-Encoding: 7bit
From: ...............
Mime-Version: 1.0 (1.0)
Date: Mon, 12 Apr 2021 18:38:07 +0530
Subject: Mail
Message-Id: ........
To: ..............
X-Mailer: iPhone Mail (18B121)

--Apple-Mail--------------------
Content-Type: image/jpeg;
name=image0.jpeg;
x-apple-part-url=------------------
Content-Disposition: inline;
filename=image0.jpeg
Content-Transfer-Encoding: base64

/9j/2wCEAAEBAQEBAQIBAQIDAgICAwQDAwMDBAUEBAQEBAUGBQUFBQUFBgYGBgYGBgYHBwcHBwcI
CAgICAkJCQkJC...NIs1t/
tRv9qjooKP/Z
--Apple-Mail---------------------
Content-Type: text/plain;
charset=us-ascii
Content-Transfer-Encoding: 7bit

Sent from my iPhone
--Apple-Mail----------
`

[robert-virkus]

Thanks for the report, can you upload a complete example (make sure to remove any private information) of such a mail here? Alternatively send me such a message to robert -at- enough --dot-- de.

[xMonty]

I mailed you a sample email

[robert-virkus]

Thanks again for the test mail and your report!

You need to update your packages:

enough_mail: ^1.2.2
enough_mail_html: ^1.1.0
enough_mail_flutter: ^1.1.0

The problem was that the inline part did not have a Content-ID header, so the html package now detects this and uses fetch:// link to instead link to to the fetchID rather than the CID. Additionally, it turned out that the MimeMessage.getPart(fetchId) implementation was broken for the case of the fetchID being 1.

[xMonty]

Hi, looks fixed the email is loading correctly now.
However there is another mail thats crashing not sure if the issue is related
E/flutter ( 6452): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Bad state: No element E/flutter ( 6452): #0 List.last (dart:core-patch/growable_array.dart:337:5) E/flutter ( 6452): #1 TextMimeData._parseContent package:enough_mail/mime_data.dart:128 E/flutter ( 6452): #2 MimeData.parse package:enough_mail/mime_data.dart:59 E/flutter ( 6452): #3 MimePart.parse package:enough_mail/mime_message.dart:301 E/flutter ( 6452): #4 MimeMessage.parseFromText package:enough_mail/mime_message.dart:502 E/flutter ( 6452): #5 _MessageViewState.loadMessage package:instantmb_flutter/…/inbox/message_view.dart:85 E/flutter ( 6452): <asynchronous suspension>

i am emailing the mail that causes this to you

[robert-virkus]

Strange, I cannot reproduce the problem with the mail text you sent me.
From the stacktrace I would assume that the boudary was somehow misinterepreted, the relevant code part seem to be:

final splitBoundary = '--' + contentTypeHeader!.boundary! + '\r\n';
final childParts = bodyText.split(splitBoundary);
if (!bodyText.startsWith(splitBoundary)) {
  // mime-readers can ignore the preamble:
  childParts.removeAt(0);
}
var lastPart = childParts.last; // <-- in your case childParts seems to be empty

Do you have any other way how to reproduce this?

[xMonty]

The issue seems to be because of this code
if (headerParseResult.bodyStartIndex! >= text.length) { bodyText = ''; } else { bodyText = text.substring(headerParseResult.bodyStartIndex!); }

bodyText is set to '' as headerParseResult.bodyStartIndex is 10319 and text.length is 10317

since bodyText is ''
final childParts = bodyText.split(splitBoundary);
childParts is 0 length array

Also just FYI i am importing enough mail like this in yaml
enough_mail_flutter: #any git: url: https://github.com/Enough-Software/enough_mail_flutter.git ref: main

i am not importing any other dependencies from enough mail directly

[robert-virkus]

Thanks, this seems to imply there is no body detected at all. Could it be that the text lines are not separated by \r\n, perhaps only with \n? Still, I'm still puzzled about me not being able to reproduce this problem with the message you sent me...

[xMonty]

I think this could be some issue at my end as my mails are being saved in a database and when i send a new mail its working.
another thing though when i am sending the email i am adding image first and then the text "Sent from my iPhone" but when its being rendered the text comes first and then the image is being rendered

[robert-virkus]

You could try to replace newlines with the MIME line breaks like this:

final mimeText = text.replaceAll('\n', '\r\n');
final mime = MimeMessage.parseFromText(mimeText);

And yes, I am aware about the ordering of inline parts and have created this bug to track it:
Enough-Software/enough_mail_html#7