Solution for SSL error reported by redmine2.3.0 mail server on centos

After the twists and turns of redmine2.3.0, I went to configure the email server happily and thought that the configuration was complete. Who knows that there was another problem when I clicked to send the test email after the configuration was completed, oh my God. The error message is as follows:

(Wrong argument (fixnum )! (Expected kind of OpenSSL: SSL: sslcontext ))

Go to the Internet and find the solution as follows:

If it is redmine2.0, you can add this sentence in the mail server configuration (previously added this sentence, who knows it is invalid for 2.3.0 ):

Openssl_verify_mode 'none'

If it is 2.3.0, add this sentence to solve it.

Enable_starttls_auto: false

It is over!