User Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-GB; rv:39.0) Gecko/20100101 Linux Mint/17.1 (Rebecca) Firefox/39.0 Build ID: 20160315153207 Steps to reproduce: cam.ac.uk | Hermes Cambridge Mail | http://pastebin.com/raw/TwynaMNB
I don't think we need any domains other than cam.ac.uk because each domain seems to have a DNS MX entry of "mx.cam.ac.uk". The public suffix list (https://publicsuffix.org/list/) recognizes ac.uk as a top-level-domain, which means that Thunderbird's logic will derive the domain "cam.ac.uk" from the MX lookup, using the "cam.ac.uk" domain. Having said that, it looks like there are a fair number of manual steps involved here, I wonder if it's actually helpful to be enabling autoconfig. Relatedly, what made you decide to add entries for this domain? Is this a request from a forum somewhere? Are you finding popular domains? Thanks!
I can't remember why Do you want to change the status to WON'T FIX due to the number of manual steps involved.
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