Mark - adjusting this setting in mailman.cfg seemed to do the trick. No more errors and postfix is able to send mail out to our Amazon SES relays just fine now.
Thank you,
On Mon, Mar 10, 2025 at 6:57 PM Mark Sapiro <mark@msapiro.net> wrote:
On 3/11/25 7:06 AM, Jose Bernal via Mailman-users wrote:
Here is the message. We've got several thousand log entries like this
now:
*554 Transaction failed: Duplicate header 'DKIM-Signature'* Mar 10 08:31:10 mail1 postfix/smtp[217753]: 738B53F15E: to=< brian@brianmichaelslaw.com>, relay=xxx.org[44.225.xxx.xx]:587, delay=37, delays=2/35/0.16/0.13, dsn=5.0.0, status=bounced (host said: 554 Transaction failed: Duplicate header 'DKIM-Signature'. (in reply to end
of
DATA command))
This is Amazon SES being stupid, but you can avoid this issue by setting
remove_dkim_headers: yesin the
[mta]section ofmailman.cfg.-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
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