Hello. Am 30.05.2016 um 05:46 schrieb Mark Constable: > Our recipient client gets a bounce from our server when they try to > send to, for instance, @dss.gov.au so I presume these servers are not > falling back to an unencrypted connection. This is a recent example > of our client trying to send to x...@dss.gov.au...
It's YOUR server that ist not falling back to unencrypted. And these bounces are for OUTBOUND mail. Which version of courier do you use? Newer courier should fall back to unencrypted since 0.71, released in March 2013 (according to [1]). What are your TLS settings in "courierd" file? Especially TLS_PROTOCOL and TLS_CIPHER_LIST. You can disable STARTTLS for outbound mail completely with the ESMTP_USE_STARTTLS set to 0. But the whole internet is moving towards TLS and you want to be the one to move the other way. Correct your settings, if the other hand has problems, inform them to correct their settings and everything will work. :) [1]: https://sourceforge.net/p/courier/courier.git/ci/master/tree/courier/ChangeLog - Bernd
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