Redmine

Hello ?

I use Redmine 2.6.0.stable

because of Mail failure, I ask a question.

"메일을 전송하는 과정에 오류가 발생했습니다. (553 5.1.2 The address specified is not a valid RFC-5321 address. b6sm12420744pbu.90 - gsmtp )"

I don't know RFC-5321. and, I don't know what to do.

this is configuration.yml info ~~~

delivery_method: :smtp
smtp_settings:
address: smtp.gmail.com
port: 587
domain: smtp.gmail.com
authentication: :plain
user_name: 메일 계정
password: 비번

I don't use this option because of start failure.
(enable_starttls_auto: true , tls = true )

answer. please

thanks.