How and where do I file a bug report?

Hi
During the deletion of an account Opera Mail crashed.
I ended up with a Opera that shows the account in E-mail list but not in the accounts mgmt list.
I removed the folder that contains the e-mail body but the headers of the emails are still shown.
If I rightclick on the e-mail account Opera crashes.

How do I remove all listed e-mail headers

They are not gibberish and come from a news agency I subscribed to. The headers are thusly:
Received: from zhhdzmsp-mxin16.bluewin.ch (195.186.227.152) by
mbox44.it.bwns.ch (9.0.023.04) id 57CF41F901553414 for kingma@bluewin.ch; Mon,
10 Oct 2016 05:30:40 +0000
X-Bluewin-Spam-Analysis: v=2.1 cv=U+Ql1lzX c=1 sm=1 tr=0 b=1 a=MiLTiWc9JtiziXrwKSsMYQ==:117 a=MiLTiWc9JtiziXrwKSsMYQ==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=6giede-wJD4A:10 a=CH0kA5CcgfcA:10 a=r77TgQKjGQsHNAKrUKIA:9 a=tST59n_CAAAA:8 a=qDxqid5yQrs4ofbIo5MA:9 a=rnEkUm7XtHRd-KvB:21 a=-Wh1SFU02EBiYKpH:21 a=QEXdDO2ut3YA:10 a=hNFa2kPEML4A:10 a=SSmOFEACAAAA:8 a=3g80flMcAAAA:8 a=3IeLnGJ6AAAA:8 a=Y7UbuNlPAAAA:8 a=Nato-lChFvB9O-yZeDoA:9 a=VulRcE4bMqLHQWW4:21 a=laBfexxcV60PE-Cg:21 a=7zl0GXmszp3xJ9xL:21 a=gKO2Hq4RSVkA:10 a=W_S_7VecoQA:10 a=frz4AuCg-hUA:10 a=ezZP7l2yBGsA:10 a=p403mkujtbAA:10 a=q7xmFlB--d605hAxylca:22 a=zjWhRoSqWz9hl55Hdlzg:22 a=3urWGuTZa-U-TZ_dHwj2:22 a=CIX2fKDqIAj4SMstqDkk:22 a=kdnj2-36IGcqZfts4Ro1:22
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Received: from [13.111.14.63] ([13.111.14.63:59853] helo=mta.email.nzz.ch) by
zhhdzmsp-mxin16.bluewin.ch (envelope-from
bounce-1355_HTML-170325164-878252-7239191-80@bounce.email.nzz.ch) (ecelerity
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2016 05:30:39 +0000
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=200608; d=email.nzz.ch; h=From:To:Subject:Date:List-Unsubscribe:MIME-Version:List-ID:Message-ID:Content-Type; i=nzzam_osc_ja-reply@email.nzz.ch; bh=1lg/O45c6eqakoz0em+m8r5sM9I=; b=YwHbgh9UWWUZgJPs27GJgh5vKjrTfUt96veajJSzQ+yB+07y7NYHV2+jR9GT8bU1GiNuPOJy3yex Q5e5qIHNdfZKbPpDdhvCGsPjhGkzrpkE4SE+Jq4ppNYvTIVCP7OwEIVcaJSyJ91Cl42/UFFfRRuM V88a10w5vlSrwLikz9c=
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Oct 2016 05:30:08 +0000 (envelope-from
bounce-1355_HTML-170325164-878252-7239191-80@bounce.email.nzz.ch)
From: "NZZ am Morgen" nzzam_osc_ja-reply@email.nzz.ch
To: kingma@bluewin.ch
Subject: Trump setzt im zweiten TV-Duell auf Angriff statt Reue /
Mutmasslicher Anschlagsplaner von Chemnitz gefasst / Produktion von Samsung
Galaxy Note 7 ausgesetzt
Date: Mon, 10 Oct 2016 07:30:08 +0200
List-Unsubscribe: mailto:leave-fd1d157370616b2531492c-fe32157775670678741274-febf1c777d66017f-fe8f1372766d057474-ff971c70@leave.email.nzz.ch
MIME-Version: 1.0
List-Id: 7239191_878252.xt.local
X-CSA-Complaints: whitelistcomplaints@eco.de
x-job: 7239191_878252
Message-ID: 0d38ef0b-1171-4b21-9dfd-93f73957b7f9@atl1s07mta971.xt.local
Content-Type: multipart/alternative; boundary="2PIDDppaef7d=?:"

This is a multi-part message in MIME format.

They keep reappearing. Even when nothing is in them. I did like you told a couple of days ago and now there are again 20+ empty entries in the Mailinglist. I understand that you want to sell me this behaviour as a feature but I believe it is a bug. I suppose the idea is that multiple emails for a single mailinglist appear under a single entry but Opera Mail doesn-t work that way. It creates a folder for each single mail on a mailinglist. The algorithme to deduce a mailing list from the mail is flawed and should be fixed.
Now I have to delete the email AND go to the mailinglist and delete the now obsolete mailinglist header. Featurewise this quialifies as a bug.

And thankg for the time burnout, but there isn't even a select all possibility in the Mailinglist. A flaw, that in the decade with erradicated the common could is just simple not acceptable.

gmail

After deleting emails from All messages and emptying the Dustbin the emails just reappear.

Opera mail is able to keep mailinglist entries in a seperate box called Mailinglist, that is fine. However the title of the mailing list are obscure, silly or both. I have the top 8 mailing lists called '0', the next one is called '03874002139a986a893bd', and 260 others with similar names. Most of them contain no entries, some 1.

How do I remove all the entries from Mailinglists?
How do I manage the Mailinglist headers?

When I click the Opera Mail icon always two windows are opened. This is not a big problem but a bit annoying.

Is it possible to only open one window when clicking or tapping the Opera Mail icon?

How do I set Opera Mail as default programme on Windows 10

E-Mail