On 24/07/2018 10:56, Robin wrote:
snip

I'll email you a link to the clear - not to say compelling - explanation
he gave; and which I very much hope you have forgotten, not deliberately
ignored.


Just FYI my email to was refused[1]. It didn't
have any naughty words in it; and just passed spam filters when I sent
it to a gmail address and a domain with TSOHost.

[1]
7/26/2018 10:10:47 AM - Server at
DB5EUR01HT007.eop-EUR01.prod.protection.outlook.com returned '550
5.4.316 Message expired, connection refused(Socket error code 10061)'

7/26/2018 10:00:46 AM - Server at davenoise.co.uk (94.136.40.51)
returned '450 4.4.316 Connection refused [Message=Socket error code
10061] [LastAttemptedServerName=davenoise.co.uk]
[LastAttemptedIP=94.136.40.51:25]
[DB5EUR01FT030.eop-EUR01.prod.protection.outlook.com](Socket error code
10061)'

--
Robin
reply-to address is (intended to be) valid