Hi Dmitriy I had figure out the problem,
I switch another mail server use normally smtp protocol with 25 port,
then the mail system is working correctly. after I switch back and use smtp with 25 port and set
mail.smtp.starttls.enable=false every mail was sent immediately.
Like you said maybe this mail server need some additional options or other parameters.
Sending mail is an important procedure in blynk I purpose add more parameters in it 