Rails ActionMailer with multiple SMTP servers
Solution 1
Based on the Oreilly article, I came up with the solution I wrote about here: http://transfs.com/devblog/2009/12/03/custom-smtp-settings-for-a-specific-actionmailer-subclass
Here's the relevant code:
class MailerWithCustomSmtp < ActionMailer::Base
SMTP_SETTINGS = {
:address => "smtp.gmail.com",
:port => 587,
:authentication => :plain,
:user_name => "[email protected]",
:password => 'password',
}
def awesome_email(bidder, options={})
with_custom_smtp_settings do
subject 'Awesome Email D00D!'
recipients '[email protected]'
from '[email protected]'
body 'Hope this works...'
end
end
# Override the deliver! method so that we can reset our custom smtp server settings
def deliver!(mail = @mail)
out = super
reset_smtp_settings if @_temp_smtp_settings
out
end
private
def with_custom_smtp_settings(&block)
@_temp_smtp_settings = @@smtp_settings
@@smtp_settings = SMTP_SETTINGS
yield
end
def reset_smtp_settings
@@smtp_settings = @_temp_smtp_settings
@_temp_smtp_settings = nil
end
end
Solution 2
class UserMailer < ActionMailer::Base
def welcome_email(user, company)
@user = user
@url = user_url(@user)
delivery_options = { user_name: company.smtp_user,
password: company.smtp_password,
address: company.smtp_host }
mail(to: @user.email,
subject: "Please see the Terms and Conditions attached",
delivery_method_options: delivery_options)
end
end
Rails 4 allows for dynamic delivery options. The above code is straight from the action mailer basics guide, which you can find here: http://guides.rubyonrails.org/v4.0/action_mailer_basics.html#sending-emails-with-dynamic-delivery-options
With this, it is possible to have different smtp settings for every email you send, or, like in your use case for different sub classes like UserMailer, OtherMailer etc.
Solution 3
Solution for Rails 4.2+:
config/secrets.yml:
production:
gmail_smtp:
:authentication: "plain"
:address: "smtp.gmail.com"
:port: 587
:domain: "zzz.com"
:user_name: "[email protected]"
:password: "zzz"
:enable_starttls_auto: true
mandrill_smtp:
:authentication: "plain"
:address: "smtp.mandrillapp.com"
:port: 587
:domain: "zzz.com"
:user_name: "[email protected]"
:password: "zzz"
:enable_starttls_auto: true
mailgun_smtp:
:authentication: "plain"
:address: "smtp.mailgun.org"
:port: 587
:domain: "zzz.com"
:user_name: "[email protected]"
:password: "zzz"
:enable_starttls_auto: true
config/environments/production.rb:
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = Rails.application.secrets.gmail_smtp
app/mailers/application_mailer.rb:
class ApplicationMailer < ActionMailer::Base
default from: '"ZZZ" <[email protected]>'
private
def gmail_delivery
mail.delivery_method.settings = Rails.application.secrets.gmail_smtp
end
def mandrill_delivery
mail.delivery_method.settings = Rails.application.secrets.mandrill_smtp
end
def mailgun_delivery
mail.delivery_method.settings = Rails.application.secrets.mailgun_smtp
end
end
app/mailers/user_mailer.rb:
class UserMailer < ApplicationMailer
# after_action :gmail_delivery, only: [:notify_user]
after_action :mandrill_delivery, only: [:newsletter]
after_action :mailgun_delivery, only: [:newsletter2]
def newsletter(user_id); '...' end # this will be sent through mandrill smtp
def newsletter2(user_id); '...' end # this will be sent through mailgun smtp
def notify_user(user_id); '...' end # this will be sent through gmail smtp
end
Solution 4
For anybody approaching this issue with later versions (3+) of Rails, try this
http://guides.rubyonrails.org/action_mailer_basics.html#sending-emails-with-dynamic-delivery-options
Solution 5
Tried to use jkrall's option with Rails 3.2.1 but for some reason it wouldn't override default configuration, but doing:
MyMailer.my_email.delivery_method.settings.merge!(SMTP_SETTINGS).deliver
Similar to http://www.scottw.com/multiple-smtp-servers-with-action-mailer, made it work.
Admin
Updated on June 04, 2022Comments
-
Admin almost 2 years
I have a need to use two different smtp servers in a Rails application. It appears that the way ActionMailer is constructed, it is not possible to have different smtp_settings for a subclass. I could reload the smtp settings for each mailer class whenever a message is being sent, but that messes up the ExceptionNotifier plugin which is outside my control (unless I mess with it too). Does anyone have a solution/plugin for something like this?
Ideally I would like to have
class UserMailer < ActionMailer::Base; end
and then set in environment.rb
ActionMailer::Base.smtp_settings = standard_smtp_settings UserMailer.smtp_settings = user_smtp_settings
Thus, most of my mailers including ExceptionNotifier would pickup the default settings, but the UserMailer would use a paid relay service.