mail to gmail does not work with "SSL connection using ECDHE_RSA_AES_256_GCM_SHA384"

Question

I have a Raspberry Pi 3 model B+ that sends mail to gmail perfectly and in /var/log/syslog I see

SSL connection using RSA_AES_128_CBC_SHA1

My new PiZero can NOT send mail to gmail, and in /var/log/syslog I see

SSL connection using ECDHE_RSA_AES_256_GCM_SHA384

How can I change that setting ? Thanks.

PD.- working one has :

pi@odin:~ $ ssh -V
OpenSSH_6.7p1 Raspbian-5+deb8u7, OpenSSL 1.0.1t  3 May 2016

The non-working is :

sebas@pi0alby:~ $ ssh -V
OpenSSH_7.9p1 Raspbian-10, OpenSSL 1.1.1c  28 May 2019