ActionMailer fix for ZOHO MAIL

zoho_action_mailer_fix.txt

Same thing happened to me, about the error EOFError, Completed 500 Internal Server Error.
The weird thing was that devise gem, was working sweet. But my custom mailers not. So I wondered, WHY THE HELL DEVISE WAS WORKING AND THE REST NOT?
The answer is that in devise configuration uses ActionMailer::Base as mailer sender. But my custom mailers were using ApplicationMailer class, a derivate of ActionMailer::Base, so I went to take a look at '/app/mailers/application_mailer.rb' to see what's wrong… and i've found that ApplicationMailer class has a default 'from' value which throws an error because obviously that email does not exist. Now by default ActionMailer comes like this:

class ApplicationMailer < ActionMailer::Base
  default from: 'from@example.com'
  layout 'mailer'
end

So what I did was that I removed the 'default from….' line and I just kept this:

class ApplicationMailer < ActionMailer::Base
  layout 'mailer'
end

Now ApplicationMailer class and all its children classes will use the default values you set in your mailer initializer wherever it is, mine is at '/config/initializers/mailer.rb':

Rails.application.configure do
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address => 'smtp.zoho.com',
    :port => '587',
    :domain => 'mydomain.com',
    :user_name => ENV['MAILER_USER'], # mailer@mydomail.com
    :password => ENV['MAILER_PASS'],
    :authentication => :plain,
   :enable_starttls_auto => true
  }
  config.action_mailer.default_options = {
    :from => ENV['MAILER_FROM_ADDR'] # support@mydomain.com
  }
end

Hope It helps for someone. That worked for me