Rails 4 Net::SMTPSyntaxError: 501 批量电子邮件的语法错误

Question

我有一个每天发送时事通讯的 cronjob。不知为何，今天出错了。

我检查了堆栈跟踪并得到了这个

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'

最初我认为这是收件人列表中的错误电子邮件格式，但在清除了一些后，手动运行时事通讯邮件程序后我仍然会收到错误消息。

我尝试循环遍历每个收件人并向他们发送每个电子邮件，并且成功了！即使是糟糕的电子邮件。

使用 ActionMailer 发送时是否有最大收件人数？

Answer 1

据我所知，ActionMailer 对收件人的数量没有限制。您收到的错误来自您的 SMTP 服务器，因此这很可能是故障所在。

在net/smtp.rb:869 发送多个RCPT TO: 命令之一时返回错误。最可能的解释是地址格式错误，但您声明每个地址在单独发送时都有效。您可以尝试将电子邮件发送到您自己的大量地址，看看是否出现相同的错误。

无论您是否找到原因，您都可能需要考虑分别发送每份简报。如果避免这样的故障，每个收件人发送一封邮件的额外开销可能是值得的。祝你好运！