I’m using the mail gem and received this error when sending emails:

   1  530 5.7.0 Must issue a STARTTLS command first

The fix was to first install the tlsmail gem:

   1  gem install tlsmail

Then I had to add this to config/initializers/email.rb:

   1  require 'tlsmail' 
   2  Net::SMTP.enable_tls(OpenSSL::SSL::VERIFY_NONE)

Bulk operations in mutt, a console based email client, are easy. Here’s how to delete messages containing the keyword ‘Newsletter’.

   1  T
   2  Newsletter
   3  ;
   4  d
   5  $

T – asks which messages you want to tag and you reply with ‘Newsletter’.

; – asks which action you want to run on the tagged messages.

d – tells that the action you want is delete.

$ – synchronizes the view with the underlying persistence layer.