# How to: Individualized mass email with ActiveMailer - separa

**URL:** <https://www.ruby-forum.com/t/how-to-individualized-mass-email-with-activemailer-separa/74682>\
**Category:** Rails\
**Created:** [November 7, 2006, 10:52am UTC](https://www.ruby-forum.com/t/how-to-individualized-mass-email-with-activemailer-separa/74682 "2006-11-07T10:52:32Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![underbjerg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5e925/32.png) [@underbjerg](https://www.ruby-forum.com/u/underbjerg)\
**Post date:** [November 7, 2006, 10:52am UTC](https://www.ruby-forum.com/t/how-to-individualized-mass-email-with-activemailer-separa/74682/1 "2006-11-07T10:52:32Z")

</div>

Hi,

We are building a rails application that’s sort of a CRM + room/course  
booking. Among other things, it provides a centralized database of all  
the people the company has been in contact with.

We want to provide the possibility of sending customized email messages  
to groups of contacts, for example a newsletter to 500 people starting  
with “Hi [:name:]”. The naive approach we’re using is basically placing  
the following code in the controller:

email.people.each do |p|

# This generates a custom email for that person, with fields such as

[:name:]

# filled with the person’s name

raw\_email = PeopleMailer.create\_general\_email(email, p, sent\_at)  
raw\_email.set\_content\_type(“text/html”)  
begin  
PeopleMailer.deliver(raw\_email)  
rescue Exception =\> e  
email.log += “\n” + format\_time(Time.now) + “\n” + e.message + “\n”  
end  
end

The problem is that generating the 500 individual emails takes a  
significant amount of time, which causes the browser to time out. What  
we want, is to give the user a response immidiately, and then process  
the sending of the email in the background.

How to go about this? I’ve seen the note about mass mailing on  
[http://wiki.rubyonrails.org/rails/pages/HowToSendEmailsWithActionMailer](http://wiki.rubyonrails.org/rails/pages/HowToSendEmailsWithActionMailer),  
but I couldn’t figure out whether it would work in situations where I  
want to send a customized email to each recipient.

I tried doing something like

Thread.start do

# everything as before

end

…but the thread seems to quit as soon as the controller action is  
finished rendering, and no emails are sent.

Kind regards,

Erik

---

<div class="post-metadata">

**Author:** ![underbjerg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5e925/32.png) [@underbjerg](https://www.ruby-forum.com/u/underbjerg)\
**Post date:** [November 7, 2006, 10:52am UTC](https://www.ruby-forum.com/t/how-to-individualized-mass-email-with-activemailer-separa/74682/2 "2006-11-07T10:52:48Z")

</div>

You may want to take a look at backgroundrb:

[http://groups.google.com/group/rubyonrails-talk/browse\_thread/thread/b94003dc7ccc45f6/46a7b29d5e2d5d53](http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/b94003dc7ccc45f6/46a7b29d5e2d5d53)

let me know what you find, as I’m doing the same thing right now (with  
about 200 users, and I’m doing it the naive way, which works, but I’ve  
been wanting to transition to a background process as well).

Mike

---

<div class="post-metadata">

**Author:** ![underbjerg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5e925/32.png) [@underbjerg](https://www.ruby-forum.com/u/underbjerg)\
**Post date:** [November 7, 2006, 10:52am UTC](https://www.ruby-forum.com/t/how-to-individualized-mass-email-with-activemailer-separa/74682/3 "2006-11-07T10:52:57Z")

</div>

I don’t know about running processes in the background, since our  
mailing list goes out from a cron job, but we do individualize emails,  
mainly for the point of putting in an “Unsubscribe” link for each user.  
Also, we found it was best to send the emails in slices of 50. That way  
the SMTP Session doesn’t get way too big, but it cuts way down on  
sending time. Not sure if it’s on the script side or the email server  
that slows it down(I think it’s the email server because it’s not  
caching the emails but I guess either way they have to sit around for a  
short while), but this sends about 6 emails/second. For 500 emails,  
that’s…just under a minute and a half.

Here’s the code:

This is in our main method in the model,  
Emailer.send\_daily\_announcements

@users.each\_slice(50) do |recipient\_group|

```
  # Create an SMTP connection for this group of users
  Net::SMTP.start('smtp.server.here', 25) do |smtp|

    # Send the email to each user in this group
    for recipient in recipient_group

      begin

        # Output each recipient - TESTING ONLY
        puts "Sending email to: #{recipient.email}"

        # Create the email message from our template
        email = Emailer.create_daily_announcement(recipient,

```

@other\_variables)

```
        # Send out each email
        smtp.sendmail email.encoded, email.from, email.to

      rescue Exception => e
        exceptions[recipient] = e
        logger.warn("EXCEPTION: EMAILER.ANNOUNCEMENTS:" + e)
        puts e

        smtp.finish
        smtp.start
      end

    end

  end

end

```

And our email creation method:

def daily\_announcement(user, other\_variables)

```
# Email header info
@recipients = user.email
@from = "us"
@subject = "Daily Announcements"
@content_type = "text/html"

@body["user"] = user
@body["todays_events"] = todays_events
@body["other_stuff"] = other_stuff

```

end