Severity: normal

It seems the From field is re-encoded, causing it to be different if it 
contains umlaute.
Therefore, a DKIM signature fails, and popular (/properly configured) mail 
servers reject the
messages or think they are spam

We just hit that with #838545
-zwiebelbot/#debian-devel- Debian#838545: apt not showing any package update if 
just one repo is not valid -

The original email was sent with From: =?iso-8859-1?Q?Bj=F6rn?= JACKE 
But it arrived as From: "Björn JACKE" <>

Solution: Strip DKIM fields from re-encoded emails

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (500, 'unstable-debug'), (500, 'testing'), 
(100, 'experimental'), (1, 'experimental-debug')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Debian Developer - | - free software dev

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