attach is the screen cap of settings

the thing is, it is not about my email servers settings, it is not even connecting in the first place. it is as if Avast is a firewall and blocks the connection. also note that I’m just sending plain text smtp emails, no encryption (even the password is plain text)

normal
email client–>server

avast turn on
email client-> avast → server

avast turn off
email → avast (disabled/disregard connection–> timed out

Notes:

  1. everything is OK ang working when Avast Email Scanner is “On”
  2. if avast email scanning is “off”, connection to may email server fails.
  3. from avast email scanning “on” or “off”, no configuration changes are made (see video)

my question is, how do avast intercept email connection and reroute connection?