On Fri, 18 Oct 2019 23:33:59 +0100, MArtin
 declaimed the following:

>Yes, I tried that originally before using Google, and have spent today
>trying again, unfortunately it seems my ISP while supporting smtp
>isn't compatible with exim. I couldn't persuade it to work and gave up
>and used google and still cant - looking at their support forums it
>seems a selection of other people cant get the isp smtp to work with
>with a selection of clients either.
>

 Many ISPs block use of port 25 -- one should use either 587
("submission port") or an alternate/TLS port (not sure what number that is;
google indicates blueyonder uses the obsolete port 465)

 A five year old article
https://www.vultr.com/docs/setup-exim-to-send-email-using-gmail-in-debian
(may only verify what you've tried -- I don't know how your configuration
has been set-up). (Also
https://www.pontikis.net/blog/gmail-smarthost-exim4-debian )

 Possibly of note -- from your original post

>A=plain C="250 2.0.0 OK  1571140782 a10sm21277754wrm.52 - gsmtp"
>

 Your last success used "plain" protocol for authentication... I haven't
been able to find anything defining what gmail really wants these days. The
server itself doesn't list it...

220 smtp.gmail.com ESMTP j31sm2563838ota.13 - gsmtp EHLO gmail.com
250-smtp.gmail.com at your service, [2600:1700:e630:890:c932:bd85:577:9922]
250-SIZE 35882577 250-8BITMIME 250-STARTTLS 250-ENHANCEDSTATUSCODES
250-PIPELINING 250-CHUNKING 250 SMTPUTF8

(No AUTH protocol list)

>pipelined MAIL FROM: SIZE=1568: 530-5.5.1
>Authentication Required. Learn more at\n530 5.5.1

 And this just says it doesn't like whatever authentication was
attempted.

 Perhaps undoing the unsecure apps and setting up app-specific passwords
as per
https://www.lifewire.com/unlock-gmail-for-a-new-email-program-or-service-117197
4


 Unfortunately, we are at the stage where I'd have to install exim on my
web-server R-Pi to diagnose any further.


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