[Airbrake] [Production] 550 5.7.1 Reject for policy reason RULE3_2. See http://postmaster.gandi.net

[PhilippMeissner]

Airbrake error: #7324
Airbrake project: zeitkit

Error type: Net::SMTPFatalError
Error message: 550 5.7.1 Reject for policy reason RULE3_2. See http://postmaster.gandi.net
Where: contacts#create
Occurred at: Sep 18, 2018 09:11:43 UTC
First seen at: Sep 18, 2018 09:11:43 UTC
Occurrences: 0 (0 since last deploy on <no information>)
Severity: error

URL: https://www.zeitkit.com/contacts
File: /PROJECT_ROOT/vendor/ruby-2.5.1/lib/ruby/2.5.0/net/smtp.rb

Backtrace:

/PROJECT_ROOT/vendor/ruby-2.5.1/lib/ruby/2.5.0/net/smtp.rb:969:in check_response
/PROJECT_ROOT/vendor/ruby-2.5.1/lib/ruby/2.5.0/net/smtp.rb:914:in data
/PROJECT_ROOT/vendor/ruby-2.5.1/lib/ruby/2.5.0/net/smtp.rb:659:in block in send_message
/PROJECT_ROOT/vendor/ruby-2.5.1/lib/ruby/2.5.0/net/smtp.rb:854:in rcptto_list