duplicate subject lines in headers (again)

Warwick Brown Warwick.x.Brown at serco.com
Wed Nov 2 15:22:55 UTC 2016

Hi All,

I have that historic issue of sending email to yahoo due to duplicate subject lines.

I can see there is a work-around of setting "Multiple Headers" from "add" to "append", but I was wondering whether there was any appetite to get it fixed?

Also - what exactly are the implications for using "append" as opposed to "add" because there seems to be some anecdotal comments regarding breaking DKIM.


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