Sending Email error after upgrading 10_3 to v11_2 : tcp i/o time out

my configuration for SMTP for testing version 10_3 to 12_0

[smtp]
enabled = true
host = xxxxxx.fr:25
user =

password =
cert_file =
key_file =
skip_verify = true
from_address = noreply@xxxxxx.com
from_name = Grafana
ehlo_identity =
startTLS_policy =

when i tested contact point (send email test) thats work fine for version 10_3 but after upgrade doesn’t work for 11_2 and the newest 12.0 .
this message appears :

is it new parameter between 10_3 and the version up starting at 11.2.x?

i changed nothing in my config file,
i tried with version 11.1.12 => OK
i tried with version 11.2.5 => not ok

i tried with version 12.0 => NOK

only me have this problem ?