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ruby-on-railssmtppostfix-mta

Email sent from Rails + Postfix goes to spam folder

I send email from my domain using postfix without any issue. The problem is that when I send same email using a Rails application with same sender address, the message goes to spam folder in Gmail. I've tested it with and without Message-ID option in the mailer class:

default "Message-ID" => "#{Digest::SHA2.hexdigest(Time.now.to_i.to_s)}@mydomail.com"

This is my SMTP configurations:

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
    address:                 "127.0.0.1",
    port:                    25,
    enable_starttls_auto:    false
}
config.action_mailer.perform_deliveries = true

What configuration option I've missed that caused my emails to go to the spam folder?

Solution

  • It was a Postfix + DNS problem. Emails goes to spam folder in Gmail that means everything is ok with Rails. After I checked the Postfix main.cf noticed that the host value was srv1.example.com and SPF record in DNS was example.com.