打算使用 Gitlab 在公司内部管理代码，但是部署完成后发现 sidekiq 不停的发送邮件，主要原因是发送完邮件后出错

有谁遇到过这个问题吗？

下面是错误日志：

2013-03-28T17:21:14Z 24394 TID-gomcg Sidekiq::Extensions::DelayedMailer JID-53fc768885aed0fcfabde8b8 INFO: start
2013-03-28T17:21:44Z 24394 TID-gomcg Sidekiq::Extensions::DelayedMailer JID-53fc768885aed0fcfabde8b8 INFO: fail: 30.012 sec
2013-03-28T17:21:44Z 24394 TID-gomcg WARN: {"retry"=>true, "queue"=>"default", "timeout"=>30, "class"=>"Sidekiq::Extensions::DelayedMailer", "args"=>["---\n- !ruby/class 'Notify'\n- :reassigned_issue_email\n- - 3\n  - 1\n  - 3\n"], "at"=>1364489684.0476549, "jid"=>"53fc768885aed0fcfabde8b8", "error_message"=>"execution expired", "error_class"=>"Timeout::Error", "failed_at"=>"2013-03-28T16:55:28Z", "retry_count"=>6, "retried_at"=>2013-03-28 17:21:44 UTC}
2013-03-28T17:21:44Z 24394 TID-gomcg WARN: execution expired
2013-03-28T17:21:44Z 24394 TID-gomcg WARN: /home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/network/delivery_methods/sendmail.rb:61:in `close'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/network/delivery_methods/sendmail.rb:61:in `popen'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/network/delivery_methods/sendmail.rb:61:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/network/delivery_methods/sendmail.rb:57:in `deliver!'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/message.rb:2033:in `do_delivery'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/message.rb:229:in `block in deliver'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/actionmailer-3.2.13/lib/action_mailer/base.rb:415:in `block in deliver_mail'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications.rb:123:in `block in instrument'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.13/lib/active_support/notifications.rb:123:in `instrument'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/actionmailer-3.2.13/lib/action_mailer/base.rb:413:in `deliver_mail'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/mail-2.5.3/lib/mail/message.rb:229:in `deliver'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/extensions/action_mailer.rb:23:in `perform'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/processor.rb:45:in `block (3 levels) in process'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:109:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:109:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/server/timeout.rb:11:in `block in call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/server/timeout.rb:10:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:111:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/server/active_record.rb:6:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:111:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/server/retry_jobs.rb:49:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:111:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/server/logging.rb:11:in `block in call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/logging.rb:22:in `with_context'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/server/logging.rb:7:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:111:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:114:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/middleware/chain.rb:114:in `invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/processor.rb:44:in `block (2 levels) in process'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/processor.rb:80:in `stats'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/sidekiq-2.7.5/lib/sidekiq/processor.rb:43:in `block in process'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/celluloid-0.12.4/lib/celluloid/calls.rb:23:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/celluloid-0.12.4/lib/celluloid/calls.rb:23:in `public_send'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/celluloid-0.12.4/lib/celluloid/calls.rb:23:in `dispatch'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/celluloid-0.12.4/lib/celluloid/future.rb:18:in `block in initialize'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/celluloid-0.12.4/lib/celluloid/internal_pool.rb:48:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/celluloid-0.12.4/lib/celluloid/internal_pool.rb:48:in `block in create'