iso-8859-1 encoding issue when viewing mail


I'm preparing an email, and started using aerc to check the plaintext version. Emails are written using iso-8859-1 charset, with accents like ä or ö.

Maybe I did something wrong but when viewing the email in plaintext version, the body shows k<E4>ytt instead of käytt (headers show just fine)

my email template looks like this


Subject: %something%
To: %email% 
Sender: %sender%
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="%multipart_boundary%"

Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable


Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable



note : using master branch (os archlinux)
Assigned to
4 months ago
4 months ago
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~labrat 4 months ago

Any chance you can provide us with such an email? To debug this we need to be able to reproduce the issue.

Note that we would need the actual file, not just the text.

~mikael 4 months ago

I'm afraid this is not exactly what you need, but how would I send you the file otherwise ?

Delivered-To: mikael+3@domain.tld
Received: by 2000:a1c:28a:0:0:0:0:0 with SMTP id 213csp3795625wmf;
        Mon, 4 May 2020 03:07:00 -0700 (PDT)
Return-Path: <01020171df272ea7-8a8e4072-77eb-4787-b305-2b7e61e50944-000000@mail.domain.tld>
Subject: =?iso-8859-1?Q?Aktivoi_Domainn_k=E4ytt=E4j=E4tunnukset?=
To: mikael+3@domain.tld
Sender: ala.vastaa@domain.tld
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="=_q43d1ca3e5Lfaw399447d19231f3eq2w"
Date: Mon, 4 May 2020 10:06:59 +0000
From: domain@domain.tld

Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Aktivoi k=E4ytt=E4j=E4tunnuksesi Domainssa

Yst=E4v=E4llisin terveisin

Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://ww=
<html xmlns=3D"http://www.w3.org/1999/xhtml" xmlns:o=3D"urn:schemas-micro=
soft-com:office:office" xmlns:v=3D"urn:schemas-microsoft-com:vml">
        <head><!--[if gte mso 9]>
        <body class=3D"body" style=3D"padding:0 !important; margin:0 !important;=
 display:block !important; min-width:100% !important; width:100% !importa=
nt; background:#f4f4f7; -webkit-text-size-adjust:none">


~labrat 4 months ago

The issue is that by now your text is encoded as utf-8 most likely.

You are having issues with the bytes. Hence I need the bytes exactly as you see them, not after some (failed) conversions to a different encoding. Email it to me, spam@labrat.space, either directly from whatever leads to issues, or take one you already have and send it as an attachment.

~labrat 4 months ago

Ah, nevermind actually.

Which version do you run? If it's not the master branch it's known to be broken.

~mikael 4 months ago

I'm running latest master branch, still having the issue so I sent you the email as attachment

~pniedzwiedzinski 4 months ago

I have similar issue, latest aerc on archlinux. The difference is, that I'm using UTF-8

Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset=UTF-8
From: <>
To: <>
Subject: test
Date: Fri, 22 May 2020 20:53:49 +0200

To jest testowa wiadomo<C5>C4><87> zawieraj<C4><85>ca polskie znaki <3 oraz emoji <F0><9F><98><80>

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