This blog is part of our Rails 6 series. Rails 6.0 was recently released.

When using ActionMailer::Base#mail, if we want to display name and email address of the user in email, we can pass a string in format "John Smith" <john@example.com> in to, from or reply_to options.

Before Rails 6, we had to join name and email address using string interpolation as mentioned in Rails 5.2 Guides and shown below.

  email_with_name = %("John Smith" <john@example.com>)
  mail(
    to: email_with_name,
    subject: 'Hey Rails 5.2!'
  )

Problem with string interpolation is it doesn’t escape unexpected special characters like quotes(“) in the name.

Here’s an example.

Rails 5.2

irb(main):001:0> %("John P Smith" <john@example.com>)
=> "\"John P Smith\" <john@example.com>"

irb(main):002:0> %('John "P" Smith' <john@example.com>)
=> "'John \"P\" Smith' <john@example.com>"

Rails 6 adds ActionMailer::Base#email_address_with_name to join name and email address in the format "John Smith" <john@example.com> and take care of escaping special characters.

Rails 6.1.0.alpha

irb(main):001:0> ActionMailer::Base.email_address_with_name("john@example.com", "John P Smith")
=> "John P Smith <john@example.com>"

irb(main):002:0> ActionMailer::Base.email_address_with_name("john@example.com", 'John "P" Smith')
=> "\"John \\\"P\\\" Smith\" <john@example.com>"
  mail(
    to: email_address_with_name("john@example.com", "John Smith"),
    subject: 'Hey Rails 6!'
  )

Here’s the relevant pull request for this change.