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[Harri Suutari <address@concealed>]

Hello,

I'm glad to report that ARC sealing is now working fine without broken headers after upgrading Sympa to 6.2.70~dfsg-1~bpo11+1 from Debian Backports. Meanwhile I had not changed configuration, so it seems something got fixed with this newer Sympa version.

Nice! Now with functional ARC I can proceed to testing if removing the DMARC Protection is a good solution.

      Harri

On 15/07/2022 19.18, Harri Suutari wrote:

Hi,

Sympa 6.2.60~dfsg-4 on Debian 11 (Bullseye). MTA is Exim 4.94.2.

Requesting help to understand what's happening, or it is a bug here? While the ARC signing seems to work, the ARC headers seem to have a problem and the message becomes broken. Screenshot with a note below: until ARC-Seal: headers seem OK, but the next header ARC-Message-Signature: (and all following headers) is not like a separate header but looks like a continuation of the previous header.

This screenshot is from Roundcube webmail, and other email clients (Mutt, Alpine, Thunderbird) show the issue similarly.

(I remember that on previous Debian version with Sympa 6.2.40 I had a similar kind of issue with Sympa's DKIM signing headers, so could not use DKIM them. Currently DKIM is working fine.)

-- 

      Harri