[openrailwaymap] Mailing list and DMARC (WAS: Lifecycle tagging: tram or rail?)
Hi Greg,
Am 09/05/2020 um 01.53 schrieb Greg Rose via Openrailwaymap:
Not sure why this shows it was posted by a separate user with my
email address, but *I* posted this to the list.
You are posting from an @yahoo.com email address. Yahoo asks other mail
servers by using the DMARC standard not to accept emails from Yahoo
addresses which have an invalid DKIM signature.
A mailing list receives emails and resends them to the individual
recipients. The mailing list modifies the subject (adding the prefix)
and therefore breaks a signature (DKIM) which ensures that the email was
sent by the original sender. (The signature ensures that only Yahoo can
send correctly signed emails from Yahoo)
In order to make other email servers, e.g. Google and Yahoo to accept
your email sent through the list, the list changes the From header. It
is now:
From: Greg Rose via Openrailwaymap <openrailwaymap(a)openrailwaymap.org>
Best regards
Michael
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