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    <p>Rails 3 handles mail differently--and while the simple case is easier, adding the correct MIME hierarchy for multipart email with both alternative content types and (inline) attachments is rather complicated (primarily because the hierarchy needed is so complex.)</p> <p>Phil's answer will seem to work--but the attachments won't be visible on the iPhone (and perhaps other devices) since the MIME hierarchy is still incorrect.</p> <p>The correct MIME hierarchy ends up looking like this:</p> <ul> <li><code>multipart/mixed</code> <ul> <li><code>multipart/alternative</code> <ul> <li><code>multipart/related</code> <ul> <li><code>text/html</code></li> <li><code>image/png</code> (e.g. for an inline attachment; pdf would be another good example)</li> </ul></li> <li><code>text/plain</code></li> </ul></li> <li><code>application/zip</code> (e.g for an attachment--not inline)</li> </ul></li> </ul> <p>I've released a gem that helps support the correct hierarchy: <a href="https://github.com/jcoleman/mail_alternatives_with_attachments">https://github.com/jcoleman/mail_alternatives_with_attachments</a></p> <p>Typically when using ActionMailer 3, you would create a message with the following code:</p> <pre><code>class MyEmailerClass &lt; ActionMailer::Base def my_email_method(address) mail :to =&gt; address, :from =&gt; "noreply@myemail.com", :subject =&gt; "My Subject" end end </code></pre> <p>Using this gem to create an email with both alternatives and attachments you would use the following code:</p> <pre><code>class MyEmailerClass &lt; ActionMailer::Base def my_email_method(address, attachment, logo) message = prepare_message to: address, subject: "My Subject", :content_type =&gt; "multipart/mixed" message.alternative_content_types_with_attachment( :text =&gt; render_to_string(:template =&gt; "my_template.text"), :html =&gt; render_to_string("my_template.html") ) do |inline_attachments| inline_attachments.inline['logo.png'] = logo end attachments['attachment.pdf'] = attachment message end end </code></pre>
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    1. POProblem sending multipart mail using ActionMailer
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    1. COI checked out @jcoleman's gem, and I'm not sure if I'm missing something... if you render the html string before you get the inline attachments loaded, how do you reference their CIDs? If my_template.html references as the image source just logo.png, the resulting email renders well on several clients (Hotmail for instance) but not on others (iPhone, Apple Mail) because these clients go by the CID of the inline attachments. Any hints here?
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      1. USJuan Carlos Méndez
    2. CO@JuanCarlosMéndez: I hadn't run into the need for that (I'm assuming the difference here is that you're using inline attachments within the HTML, while I designed it with merely whether or not it was displayed inline by default.) I'd welcome any pull requests on the project on GitHub.
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