Emails without Message-ID header are not seen

[themchn]

• Platform: Android
• Device: LG V10
• Delta Chat Version: 0.301.1
• Expected behavior: Receive all emails that arrive in inbox
• Actual behavior: Certain messages are not visible in deltachat
• Steps to reproduce the problem:

I'm trying to get an email from some software into deltachat but the client doesn't seem to acknowledge that the email even exists. The email does come into my inbox without any issue. If I manually send an email from a "normal" email client then deltachat received it without any issue. Below is a copy of the headers off an email deltachat does not "see".

Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: from mymailserver
    by mymailserver (Dovecot) with LMTP id Sq06F3WIyFzUWQAAxtmbUg
    for <[email protected]>; Tue, 30 Apr 2019 10:40:05 -0700
Received: from hostname (unknown [host ip address])
    by mymailserver (Postfix) with ESMTPSA id 4F53E2083D
    for <[email protected]>; Tue, 30 Apr 2019 10:40:05 -0700 (MST)
Date: Tue, 30 Apr 2019 10:40:05 -0700
From: [email protected]
To: [email protected]
Subject: Test Notification
Priority: normal
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

And this is a copy of the headers from an email I sent from the same address via a webmail client which deltachat can see without any issue.

Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: from mymailserver
    by mymailserver (Dovecot) with LMTP id a6gMMASlyFy4YwAAxtmbUg
    for <[email protected]>; Tue, 30 Apr 2019 12:41:56 -0700
Received: from mymailserver (localhost [127.0.0.1])
    by mymailserver (Postfix) with ESMTPA id B14772083D
    for <[email protected]>; Tue, 30 Apr 2019 12:41:56 -0700 (MST)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII;
    format=flowed
Content-Transfer-Encoding: 7bit
Date: Tue, 30 Apr 2019 12:41:56 -0700
From: [email protected]
To: [email protected]
Subject: test from roundcube
Message-ID: <[email protected]>
X-Sender: [email protected]
User-Agent: Roundcube Webmail/1.2.3

My suspicious is due to the lack of a Message-ID in the problem email as out of all the emails I have received, the common thing between them and this problem email is they all have a Message-ID.

[r10s]

i think missing Messages-ID headers have the potential to cause any kind of problems :)

[themchn]

Perhaps I should be filing a issue with the software that is responsible for sending the message then. Still, other email clients don't have an issue viewing the message.

[r10s]

normally, it should be displayed anyway in delta chat, iirc, delta chat creates a message-ID on receiving if it is missing. so, the issue of the not-appearing message may be different.

the message-id as such is a SHOULD in RFC 5322 iirc, however, i think a MUA should have very good reasons to leave it out.

[themchn]

Well I can confirm that the lack of a message-ID header is the problem. I've set sieve to add that header in this specific case and now it comes into deltachat without any issue.

[r10s]

@themchn thanks for checking!
i'll move this issue to the core, however. there seems not to be much android can do about this.

[csb0730]

With issue #534 I did the same findings. See comment from Jan 23th.

I think label "bug" is appropriate here.