This limited SendGrid WebAPI integration provides functionality for managing sub users and sending mail through the WebAPI either manually or using an ActionMailer.

See: sendgrid.com/docs/API_Reference/Web_API/

In your initializer:

SendgridApi.configure do |config|
  config.api_user = "api-user"
  config.api_key  = "api-key"
end

client = SendgridApi::Client.new({api_user: "api-user", api_key: "api-key"})

mail = SendgridApi::Mail.new(client)

or initialize client with pass through arguments

mail = SendgridApi::Mail.new(nil, {api_user: "api_user", api-key: "api-key"})
mail.category("your_category")
mail.filters(:openclick)
mail.filters({openclick: {settings: {enabled: 1}}})
mail.unique_args(key: "value")
mail.queue(to: "[email protected]", from: "[email protected]", subject: "subject", text: "text", html: "HTML")

For sending mail to non-ascii addresses, ensure that the addresses is passed to mail as an encoded string such as

to = Mail::Address.new("[email protected]").tap { |m| m.display_name = "Øwen" }.encoded

sub_user = SendgridApi::SubUser.new(client).create(
  company:          "company",
  username:         "username",
  email:            "email",
  first_name:       "first_name",
  last_name:        "last_name",
  address:          "address",
  city:             "city",
  state:            "state",
  zip:              "zip",
  country:          "country",
  phone:            "phone",
  website:          "website",
  password:         "password",
  confirm_password: "confirm_password"
)

SendgridApi::SubUser.new(client).set_limit({user: "username", credits: 500})
SendgridApi::SubUser.new(client).get_limit(user: "username")
SendgridApi::SubUser.new(client).append_ip({user: "username", set: "127.0.0.1"})

SendgridApi::SubUser.new(client).setup_dkim_app({user: "username", domain: "domain.com", use_from: 0})
SendgridApi::SubUser.new(client).setup_eventnotify({user: "username", url: "http://www.callback.com", processed: 1})

For options, see: http://sendgrid.com/docs/API_Reference/Customer_Subuser_API/apps.html

* Bounces
* Invalid emails
* Spam report

In your initializer:

ActionMailer::Base.add_delivery_method :sendgrid_api, Mail::Sendgrid, api_user: "api-user", api_key: "api-key"

Use your usual action mailer code after setting the delivery method

default delivery_method: :sendgrid_api

Headers must be modified within the ActionMailer such as: (see sendgrid.com/docs/API_Reference/SMTP_API/index.html for reference)

headers['X-SMTPAPI'] = {
  category: "your_category",
  unique_args: {
    id: 1
  },
  filters: {
    opentrack:  {settings: {enable: 1}},
    clicktrack: {settings: {enable: 1}},
  }
}.to_s

or

headers['X-SMTPAPI'] = SendgridApi::XSmtp.new do |x|
  x.category("your_category")
  x.unique_args(id: 1)
  x.filters(:opentrack)
  x.filters(:clicktrack)
end.to_s

or

headers['X-SMTPAPI'] = SendgridApi::XSmtp.new().to_s

or

headers 'X-SMTPAPI' => { "category" => "your_category" }.to_s

client = SendgridApi::Client.new({ api_user: "api-user2", api_key: "api-key2" })
m = mail(
    to: "[email protected]",
    from: "[email protected]",
    subject: "subject",
    text: "text",
    html: "HTML") do |format|
  format.text { render text: @text_content }
  format.html { Premailer.new(@html_content, self.premailer_options).to_inline_css }
end
m.delivery_method.client = client
m.deliver!

bcc, reply_to and return_path are also supported

There are inconsistancies between mail versions and thus Rails 3 and 4 implementations are slightly different, to run the tests for both versions 2.5.x and 2.6.x of the mail gem, you can use tha appraisal gem.

appraisal mail-2.5 rspec spec/delivery_methods/sendgrid_spec.rb
appraisal mail-2.6 rspec spec/delivery_methods/sendgrid_spec.rb