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Editorial Team
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Asked: 2026-06-13T12:25:56+00:00

I have a problem where ActionMailer sometimes doesn’t send emails. It is reproducible and

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I have a problem where ActionMailer sometimes doesn’t send emails. It is reproducible and affects certain people at certain times, although what is causing it is a mystery.

It fails silently, although config.action_mailer.raise_delivery_errors = true is set.

It enters the mail() routine, claims it has rendered the template:

Rendered notifier/notify_comment.html.erb (0.9ms)

And then skips the delivery and moves onto the next one. The next one is rendered & delivered no problem. When emails are delivered, they are also printed to the console, so I can see it. The content of every email is the same, only the recipient is different.

I cannot understand why this would be intermittent.

How can I go about debugging this?

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1 Answer

  1. Editorial Team

    Each instance of the mailer can only send 1 email.

    Do you have code that looks like this inside of the mailer?

    @subscribers.each do |s|
  mail(
    :to => s.email,
    :subject => "Foo Foo",
    :from => "someone@example.com", 
    :template_name => 'template_name'
  ).deliver
end

    This doesn’t seem to work. Iterate over the subscribers outside of the mailer, and call it once:

    In a controller or model:

    @subscribers.each do |s|
  Notifier.send_to_subscriber(s, @comment)
end

    This was my experience in Rails 3.2.2. FWIW, I think what happens is that the mail object falls out of scope.

    This approach may be slow, so be sure to send emails in a separate thread.

    Reference and ideas: How to send multiple emails with SendGrid?

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