why thunderbird can not connect my email on vps?

I want to build a simple email server on vps with no any ssl certification. AFTER master the simple email server , I want to build a email server on vps with ssl certification.Here is the way to do it: apt-get install postfix dovecot-imapd dovecot-pop3d

My domain is noxp.info , email account is joe@noxp.info , passwd for the email is “itisatest” , you can ssh the account and test to send and receive emails, it is ok.

joe@born:~$ cat /etc/postfix/main.cf smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no append_dot_mydomain = no readme_directory = no myhostname = born alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = noxp.info, born, localhost.localdomain, localhost relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all

It seems to me that everything is in good order. But i am confused that the email server can’t connect by thunderbird.

Please try all of them.

How to fix it ?Thank for your answer.