501 <>: missing or malformed local part

I get this error when trying to use the actionmailer gem:

Net::SMTPSyntaxError in EmailerController#sendmail

501 <>: missing or malformed local part

Application Trace | Framework Trace | Full Trace

/usr/lib/ruby/1.8/net/smtp.rb:680:in `check_response' /usr/lib/ruby/1.8/net/smtp.rb:653:in `getok' /usr/lib/ruby/1.8/net/smtp.rb:635:in `rcptto' /usr/lib/ruby/1.8/net/smtp.rb:546:in `send0' /usr/lib/ruby/1.8/net/smtp.rb:545:in `each' /usr/lib/ruby/1.8/net/smtp.rb:545:in `send0' /usr/lib/ruby/1.8/net/smtp.rb:472:in `sendmail' vendor/rails/actionmailer/lib/action_mailer/base.rb:629:in `perform_delivery_smtp' /usr/lib/ruby/1.8/net/smtp.rb:379:in `start' /usr/lib/ruby/1.8/net/smtp.rb:316:in `start' vendor/rails/actionmailer/lib/action_mailer/base.rb:627:in `perform_delivery_smtp' vendor/rails/actionmailer/lib/action_mailer/base.rb:508:in `__send__' vendor/rails/actionmailer/lib/action_mailer/base.rb:508:in `deliver!' vendor/rails/actionmailer/lib/action_mailer/base.rb:383:in `method_missing' app/controllers/emailer_controller.rb:6:in `sendmail'

What am I doing wrong?

I get this error when trying to use the actionmailer gem:

Net::SMTPSyntaxError in EmailerController#sendmail

501 <>: missing or malformed local part

#1842 ActionMailer doesn't correctly use return-path header - Ruby on Rails - rails ?

Fred

Thanks. My problem was the wrong email format was being entered to the recipients I was sending to. I think many of these errors are due to the fact that in the controller they do not get the correct values from their email form.