Rails - Aug 2011 - Mailer failure: ArgumentError: A sender (Return-Path, Sender or From) required to send a message

I have two mailer procedures in the same app and same mailer (Rails
3.1/1.9.2). The first one fails with the message below, the second works
fine. Both these results are through irb. Anyone have an idea as to why?
Also, in my application.rb I do have: ActionMailer::Base.default :from =>
"WaveLineup <system-+T6PWOEcvEy41k5uCYKmRQ@public.gmane.org>"
defined.

FAILS
  def password_reset_instructions(user)
      @user = user
      @url = edit_password_reset_url(user.perishable_token)
      mail(:to => user.email, :subject => ''Password Reset for
WaveLineup'')
  end

  Error message:
  ruby-1.9.2-p290 :010 >
SystemMailer.password_reset_instructions(user).deliver
  ArgumentError: A sender (Return-Path, Sender or From) required to send a
message


WORKS FINE
  def wavelineup_invitation(invitation)
      @referring_user = invitation.referring_user
      @token = invitation.token
      mail(:to => invitation.email, :subject => ''Invitation to
WaveLineup
Travel Card System for Network practitioners'')
  end

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What is the output when you try this:

  def password_reset_instructions(user)
      @user = user
      p @user
      @url = edit_password_reset_url(user.perishable_token)
      mail(:to => user.email, :subject => ''Password Reset for
WaveLineup'')
  end

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On Tue, Aug 16, 2011 at 1:38 PM, 7stud --
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> What is the output when you try this:
>
>  def password_reset_instructions(user)
>      @user = user
>       p @user
>       @url = edit_password_reset_url(user.perishable_token)
>      mail(:to => user.email, :subject => ''Password Reset for
> WaveLineup'')
>  end
>
> Thanks... actually I just honed in on the next line starting with @url...
This is where it is failing. Turns out it was that I was missing the default
app host in my development.rb file. What wasted all this time is that the
error message seemingly was not the cause of the problem or even accurate...
I know better now but usually ruby/rails messages are more accurate.

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