member_access_requested_email can include no To: address
cc: /@rymai
https://sentry.gitlap.com/gitlab/gitlabcom/issues/3600/
ArgumentError: An SMTP To address is required to send a message. Set the message smtp_envelope_to, to, cc, or bcc address.
lib/gitlab/sidekiq_middleware/memory_killer.rb:17:in `call'
yield
lib/gitlab/sidekiq_middleware/arguments_logger.rb:6:in `call'
yield
lib/gitlab/metrics/sidekiq_middleware.rb:11:in `block in call'
trans.run { yield }
lib/gitlab/metrics/transaction.rb:45:in `run'
yield
lib/gitlab/metrics/sidekiq_middleware.rb:11:in `call'
trans.run { yield }
...
(83 additional frame(s) were not displayed)