Yes, just like that, when you change the port it starts to work.

dutchroberts wrote:
Error sending e-mail. An error occurred while attempting to establish an SSL or TLS connection.

When connecting to an SMTP service, port 587 is typically reserved for plain-text connections. If
you intended to connect to SMTP on the SSL port, try connecting to port 465 instead. Otherwise,
if you intended to use STARTTLS, make sure to use the following code:

client.Connect ("smtp-relay.sendinblue.com", 587, SecureSocketOptions.StartTls);

I had to set port to 465 on table EmailAccount if EnableSsl is true.
Under EmailAccount
set port to 465 EnableSsl True
or
set port to 587 EnableSsl False