[exim] TLS unsupported protocol?

I have someone connecting to me repeatedly and failing on TLS/SSL start
up, thus:

2019-09-02 23:57:30 CONNECT: New connection from 80.82.32.21:62950 ->
195.171.43.32:25
2019-09-02 23:57:30 CONNECT: Accepting connection from: 80.82.32.21 -
not blocked by any RBL
2019-09-02 23:57:30 HELO: Accepted HELO/EHLO serv13.vsi.ru from remote
host: 80.82.32.21 (serv13.vsi.ru)
2019-09-02 23:57:30 CRYPTO: Client 80.82.32.21:62950 issued STARTTLS
2019-09-02 23:57:30 TLS error on connection from serv13.vsi.ru
[80.82.32.21] (SSL_accept): error:14209102:SSL
routines:tls_early_post_process_client_hello:unsupported protocol

is this just a case of them using SSLv2 or something I don't have
enabled at my end?

Mike