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163 Receiving Emails
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layouts/late_noticehtmlhaml would automatically be used for our HTML
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emails You can also add custom layouts if your heart desires, either at the class level or as a render option
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class LateNotice < ActionMailer::Base layout "alternative" def late_timesheet(user, week_of) mail(:to => useremail) do |format| formathtml { render :layout => "another" } end end end
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We ve now talked extensively about preparing email messages for sending, but what about actually sending them to the recipients
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1627 Sending an Email
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Sending emails only involves getting a Mail::Message object from your mailer and delivering it
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aslak = Userfind_by_name "Aslak Hellesoy" message = LateNoticelate_timesheet(aslak, 1weekago) messagedeliver
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163 Receiving Emails
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To receive emails, you need to write a public method named receive on one of your application s ActionMailer::Base subclasses It will take a Mail::Message1 object instance as its single parameter When there is incoming email to handle, you call an instance method named receive on your Mailer class The raw email string is converted into a Mail::Message object automatically and your receive method is invoked for further processing You don t have to implement the receive class method yourself, it is inherited from ActionMailer::Base2 That s all pretty confusing to explain, but simple in practice Listing 162 shows an example
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1 http://githubcom/mikel/mail 2 If you re willing to depend on Google App Engine, you should investigate the innovative Remail gem at http://githubcom/maccman/remail for an easy and powerful REST-based approach to solving the problem
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Listing 162 The simple MessageArchiver mailer class with a receive method class MessageArchiver < ActionMailer::Base def receive(email) person = Personfind_by_email(emailtofirst) personemailscreate( :subject => emailsubject, :body => emailbody ) end end
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The receive class method can be the target for a Postfix recipe or any other mail-handler process that can pipe the contents of the email to another process The rails runner command makes it easy to handle incoming mail:
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rails runner 'MessageArchiverreceive(STDINread)'
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That way, when a message is received, the receive class method would be fed the raw string content of the incoming email via STDIN
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1631 Handling Incoming Attachments
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Processing files attached to incoming email messages is just a matter of using the attachments attribute of Mail::Message, as in Listing 163 This example assumes that you have a Person class, with a has_many association to an attachment_fu object named photos
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class PhotoByEmail < ActionMailer::Base def receive(email) from = emailfromfirst person = Personfind_by_email(from) loggerwarn("Person not found [#{from}]") and return unless person if emailhas_attachments emailattachmentseach do |file| personphotoscreate(:uploaded_data => file) end end end end
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165 Testing Email Content
There s not much more to it than that, except of course to wrestle with the configuration of your mail-processor (outside of Rails) since they are notoriously difficult to configure3 After you have your mail-processor calling the rails runner command correctly, add a crontab so that incoming mail is handled about every five minutes or so, depending on the needs of your application
164 Server Con guration
Most of the time, you don t have to configure anything specifically to get mail sending to work, because your production server will have sendmail installed and Action Mailer will happily use it to send emails If you don t have sendmail installed on your server, you can try setting up Rails to send email directly via SMTP The ActionMailer::Base class has a hash named smtp_settings (server_settings prior to Rails 20) that holds configuration information The settings here will vary depending on the SMTP server that you use The sample (as shown in Listing 163) demonstrates the SMTP server settings that are available (and their default values) You ll want to add similar code to your config/environmentrb file:
Listing 163 SMTP settings for ActionMailer ActionMailer::Basesmtp_settings = { :address => 'smtpyourservercom', # default: localhost :port => 25, # default: 25 :domain => 'yourservercom', # default: localhostlocaldomain :user_name => 'user', # no default :password => 'password', # no default :authentication => :plain # :plain, :login or :cram_md5 }