On Sun, 13 Dec 2015, Alice Wonder wrote:

A big negative to Thunderbird autoconfig - it looks for http before https resulting in MITM vulnerability.

They say it is because hosting companies like godaddy don't want to have a TLS cert for every e-mail domain.

I agree with both :-)

They should have a DNS TXT field like _moz_auto.domain.tld or something that points to the authoritative TLS autoconfig server but they don't want to do that.

Do you have a link for this information? Don't see a drawback with this approach when they fallback to normal method without the record. Exchange uses a SRV record (which is better than TXT I think - _autodiscover._tcp....) but this has also issues, as they don't lookup this first, but only after they tried some other things.

Ciao
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http://www.dstoecker.eu/ (PGP key available)

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