Rails 4 Net :: SMTPSyntaxError：501批量電子郵件的語法錯誤

Question

我有一個每天發送新聞簡報的cronjob。出於某種原因，今天出現了錯誤。

我檢查堆棧跟蹤，並得到這個

Net::SMTPSyntaxError: 501 Syntax error 

    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:957:in `check_response' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:926:in `getok' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:869:in `rcptto' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:850:in `block in rcptto_list' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:848:in `each' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:848:in `rcptto_list' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:663:in `send_message' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/mail-2.6.3/lib/mail/network/delivery_methods/smtp.rb:113:in `block in deliver!' 
    from /usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/net/smtp.rb:521:in `start' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/mail-2.6.3/lib/mail/network/delivery_methods/smtp.rb:112:in `deliver!' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/mail-2.6.3/lib/mail/message.rb:2141:in `do_delivery' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/mail-2.6.3/lib/mail/message.rb:236:in `block in deliver' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/actionmailer-4.1.8/lib/action_mailer/base.rb:527:in `block in deliver_mail' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/activesupport-4.1.8/lib/active_support/notifications.rb:159:in `block in instrument' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/activesupport-4.1.8/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/activesupport-4.1.8/lib/active_support/notifications.rb:159:in `instrument' 
... 3 levels... 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/commands/console.rb:90:in `start' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/commands/console.rb:9:in `start' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:69:in `console' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:40:in `run_command!' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/commands.rb:17:in `<top (required)>' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/app_rails_loader.rb:43:in `require' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/app_rails_loader.rb:43:in `block in exec_app_rails' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/app_rails_loader.rb:32:in `loop' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/app_rails_loader.rb:32:in `exec_app_rails' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/lib/rails/cli.rb:5:in `<top (required)>' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/bin/rails:9:in `require' 
    from /var/www/lsd-core/shared/bundle/ruby/2.1.0/gems/railties-4.1.8/bin/rails:9:in `<top (required)>' 
    from /usr/local/rvm/gems/ruby-2.1.5/bin/rails:23:in `load' 
    from /usr/local/rvm/gems/ruby-2.1.5/bin/rails:23:in `<main>' 
    from /usr/local/rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `eval' 

起初我還以爲是在收件人列表中的壞電子郵件格式，但除草幾齣之後，我仍然會後手動運行出現錯誤新聞郵件。

我試着循環遍歷每個收件人，並向他們發送每封電子郵件，它工作！即使是壞的電子郵件。

使用ActionMailer發送時是否有最大數量的收件人？

Answer 1

就我所知，ActionMailer對收件人的數量沒有限制。你所得到的錯誤來源於你的SMTP服務器，所以這很可能是錯誤所在。

發送RCPT TO:命令中的一個命令時返回錯誤net/smtp.rb:869。最可能的解釋是一個格式不正確的地址，但是你聲明每個地址在發送時都能正常工作。您可以嘗試將電子郵件發送到大量自己的地址，並查看是否出現相同的錯誤。

無論您是否找到原因，您都可以考慮分別發送每封新聞稿。爲每個收件人發送一封郵件的額外開銷可能是值得的，如果它避免這樣的毛刺。祝你好運！