这边已经配置了，在电子邮件设置，测试发送，QQ邮箱能够收到了，但是在首页用邮箱注册是失败的，查看日志，显示的错误是：Job exception: Delivery failed with exitstatus 127: “/usr/sbin/sendmail -i -f "uxxxx@xxxxx.com" – "56xxxx@qq.com"”，
mail-2.8.1/lib/mail/network/delivery_methods/sendmail.rb:91:in block in popen' <internal:kernel>:90:in tap’
mail-2.8.1/lib/mail/network/delivery_methods/sendmail.rb:89:in popen' mail-2.8.1/lib/mail/network/delivery_methods/sendmail.rb:106:in old_deliver’
mail-2.8.1/lib/mail/network/delivery_methods/sendmail.rb:69:in deliver!' mail-2.8.1/lib/mail/message.rb:269:in deliver!’
/opt/bitnami/ruby/lib/ruby/3.2.0/delegate.rb:87:in method_missing' /opt/bitnami/discourse/lib/email/sender.rb:296:in send’
/opt/bitnami/discourse/app/jobs/regular/user_email.rb:79:in send_user_email' /opt/bitnami/discourse/app/jobs/regular/user_email.rb:39:in execute’
/opt/bitnami/discourse/app/jobs/base.rb:305:in block (2 levels) in perform' rails_multisite-6.0.0/lib/rails_multisite/connection_management/null_instance.rb:49:in with_connection’
rails_multisite-6.0.0/lib/rails_multisite/connection_management.rb:21:in with_connection' /opt/bitnami/discourse/app/jobs/base.rb:292:in block in perform’
/opt/bitnami/discourse/app/jobs/base.rb:288:in each' /opt/bitnami/discourse/app/jobs/base.rb:288:in perform’
sidekiq-6.5.12/lib/sidekiq/processor.rb:202:in execute_job' sidekiq-6.5.12/lib/sidekiq/processor.rb:170:in block (2 levels) in process’
sidekiq-6.5.12/lib/sidekiq/middleware/chain.rb:177:in block in invoke' /opt/bitnami/discourse/lib/sidekiq/pausable.rb:132:in call’
sidekiq-6.5.12/lib/sidekiq/middleware/chain.rb:179:in block in invoke' sidekiq-6.5.12/lib/sidekiq/middleware/chain.rb:182:in invoke’
sidekiq-6.5.12/lib/sidekiq/processor.rb:169:in block in process' sidekiq-6.5.12/lib/sidekiq/processor.rb:136:in block (6 levels) in dispatch’
sidekiq-6.5.12/lib/sidekiq/job_retry.rb:113:in local' sidekiq-6.5.12/lib/sidekiq/processor.rb:135:in block (5 levels) in dispatch’
sidekiq-6.5.12/lib/sidekiq/rails.rb:14:in block in call' activesupport-7.1.3.4/lib/active_support/reloader.rb:77:in block in wrap’
activesupport-7.1.3.4/lib/active_support/execution_wrapper.rb:92:in wrap' activesupport-7.1.3.4/lib/active_support/reloader.rb:74:in wrap’
sidekiq-6.5.12/lib/sidekiq/rails.rb:13:in call' sidekiq-6.5.12/lib/sidekiq/processor.rb:131:in block (4 levels) in dispatch’
sidekiq-6.5.12/lib/sidekiq/processor.rb:263:in stats' sidekiq-6.5.12/lib/sidekiq/processor.rb:126:in block (3 levels) in dispatch’
sidekiq-6.5.12/lib/sidekiq/job_logger.rb:13:in call' sidekiq-6.5.12/lib/sidekiq/processor.rb:125:in block (2 levels) in dispatch’
sidekiq-6.5.12/lib/sidekiq/job_retry.rb:80:in global' sidekiq-6.5.12/lib/sidekiq/processor.rb:124:in block in dispatch’
sidekiq-6.5.12/lib/sidekiq/job_logger.rb:39:in prepare' sidekiq-6.5.12/lib/sidekiq/processor.rb:123:in dispatch’
sidekiq-6.5.12/lib/sidekiq/processor.rb:168:in process' sidekiq-6.5.12/lib/sidekiq/processor.rb:78:in process_one’
sidekiq-6.5.12/lib/sidekiq/processor.rb:68:in run' sidekiq-6.5.12/lib/sidekiq/component.rb:8:in watchdog’
sidekiq-6.5.12/lib/sidekiq/component.rb:17:in `block in safe_thread’
各位大佬，有谁懂是什么原因呀？谢谢！