1.6.0 adds requirement for to address

[axlekb]

I recently upgraded from 1.5.0 to 1.6.0 and letter_opener now fails to launch emails without a to address. It is valid to send email with only cc or bcc. These emails previously did not fail and should raise errors.

# lib/letter_opener/delivery_method.rb#29
if !mail.to || mail.to.empty?
  raise ArgumentError, "SMTP To address may not be blank"
end

[nashby]

@axlekb hi! Thanks, good catch. I've fixed that in master.

[axlekb]

Thank you!!!

[yanghoxom]

for someone who was using the newest version but still can not raise the crash on local environment you can recheck the config to make sure you added this

config.action_mailer.raise_delivery_errors = true