I install the sentry on my server with the Document,one-step,one-step,use my own postgresql,I just change the Database config Finally,I invite myself by sent email,get this problem

I install the sentry on my server with the Document,one-step,one-step,use my own postgresql,I just change the Database config Finally,I invite myself by sent email,get this problem

Two possibilities one:have some error in your config file,for instance your email password or smtp server and so on two: you don't install smtp software,like postfix,sendmail and so on,and smtp is localhost in your config file