Not able to send email Net::ReadTimeout

What else can I try to make it work?

I checked logs and found nothing interesting
In production.log:

   Started PUT "/finish-installation/resend-email" for ip at 2018-10-01 19:22:45 +0000
Processing by FinishInstallationController#resend_email as HTML
  Parameters: {"authenticity_token"=>"..."}
  Rendering finish_installation/resend_email.html.erb within layouts/finish_installation
  Rendered finish_installation/resend_email.html.erb within layouts/finish_installation (0.8ms)
  Rendered common/_special_font_face.html.erb (0.2ms)
  Rendered layouts/_head.html.erb (0.3ms)
Completed 200 OK in 23ms (Views: 2.5ms | ActiveRecord: 3.6ms)

update
I manually activated account with

rake admin:create

and in sidekiq section I see this:

{"type"=>"signup", "user_id"=>1, "email_token"=>"...", "current_site_id"=>"default"} Jobs::HandledExceptionWrapper: Wrapped ArgumentError: wrong authentication type none