How to setup send HTML email with mail gem? - html

Question

I am sending email using the Mail gem. Here's my code:
require 'mail'
require 'net/smtp'
Mail.defaults do
delivery_method :smtp, { :address => "smtp.arrakis.es",
:port => 587,
:domain => 'webmail.arrakis.com',
:user_name => 'myname#domain.com',
:password => 'pass',
:authentication => 'plain',
:enable_starttls_auto => true }
end
Mail::ContentTypeField.new("text/html") #this doesnt work
msgstr= File.read('text2.txt')
list.each do |entity|
begin
Mail.deliver do
from 'myname#domain.com'
to "#{entity}"
subject 'a good subject'
body msgstr
end
rescue => e
end
end
end
I don't know how to set up the content type, so that I can format my email as html for example. Though I actually just wish to be able to define bold text like my email client does: bold text. Does anybody know which content-type I need to specify in order to achieve this, and how to implement it with mail?
Just a note, the code above works fine for sending plain text email.

Answer 1

From the documentation
Writing and sending a multipart/alternative (html and text) email
Mail makes some basic assumptions and makes doing the common thing as
simple as possible.... (asking a lot from a mail library)
mail = Mail.deliver do
to 'nicolas#test.lindsaar.net.au'
from 'Mikel Lindsaar <mikel#test.lindsaar.net.au>'
subject 'First multipart email sent with Mail'
text_part do
body 'This is plain text'
end
html_part do
content_type 'text/html; charset=UTF-8'
body '<h1>This is HTML</h1>'
end
end

Answer 2

#Simone Carletti's answer is essentially correct, but I was struggling with this and didn't want a plain text portion to my email and a separate HTML portion. If you just want the entire email to be HTML, something like this will work:
mail = Mail.deliver do
to 'nicolas#test.lindsaar.net.au'
from 'Mikel Lindsaar <mikel#test.lindsaar.net.au>'
subject 'First email sent with Mail'
content_type 'text/html; charset=UTF-8'
body '<h1>This is HTML</h1>'
end
I may have missed it, I didn't see anything in the Mail gem documentation describing how to do that, which I would think would be more common than making a multipart message. The documentation only seems to cover plain text messages and multipart messages.