Redmine

LOG:
Started POST "/admin/test_email" for 172.xx.xx.xxx at 2023-11-21 07:41:33 +0700
Processing by AdminController#test_email as HTML
Parameters: {"authenticity_token"=>"*********"}
Current user: user (id=8)
Rendering mailer/test_email.text.erb within layouts/mailer
Rendered mailer/test_email.text.erb within layouts/mailer (0.0ms)
Rendering mailer/test_email.html.erb within layouts/mailer
Rendered mailer/test_email.html.erb within layouts/mailer (0.0ms)
Redirected to http://redmine.domain.com/settings?tab=notifications
Completed 302 Found in 2573ms (ActiveRecord: 1.3ms)

ActionDispatch::Cookies::CookieOverflow (ActionDispatch::Cookies::CookieOverflow):

actionpack (5.2.3) lib/action_dispatch/middleware/cookies.rb:649:in `commit'
actionpack (5.2.3) lib/action_dispatch/middleware/cookies.rb:484:in `[]='
actionpack (5.2.3) lib/action_dispatch/middleware/session/cookie_store.rb:106:in `set_cookie'
/usr/lib/ruby/vendor_ruby/rack/session/abstract/id.rb:363:in `commit_session'
/usr/lib/ruby/vendor_ruby/rack/session/abstract/id.rb:234:in `context'
/usr/lib/ruby/vendor_ruby/rack/session/abstract/id.rb:226:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/cookies.rb:670:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (5.2.3) lib/active_support/callbacks.rb:98:in `run_callbacks'
actionpack (5.2.3) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
railties (5.2.3) lib/rails/rack/logger.rb:38:in `call_app'
railties (5.2.3) lib/rails/rack/logger.rb:26:in `block in call'
activesupport (5.2.3) lib/active_support/tagged_logging.rb:71:in `block in tagged'
activesupport (5.2.3) lib/active_support/tagged_logging.rb:28:in `tagged'
activesupport (5.2.3) lib/active_support/tagged_logging.rb:71:in `tagged'
railties (5.2.3) lib/rails/rack/logger.rb:26:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
/usr/lib/ruby/vendor_ruby/request_store/middleware.rb:19:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/request_id.rb:27:in `call'
/usr/lib/ruby/vendor_ruby/rack/method_override.rb:22:in `call'
/usr/lib/ruby/vendor_ruby/rack/runtime.rb:22:in `call'
activesupport (5.2.3) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (5.2.3) lib/action_dispatch/middleware/static.rb:127:in `call'
/usr/lib/ruby/vendor_ruby/rack/content_length.rb:15:in `call'
/usr/lib/ruby/vendor_ruby/rack/sendfile.rb:111:in `call'
railties (5.2.3) lib/rails/engine.rb:524:in `call'
/usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:160:in `accept_and_process_next_request'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:113:in `main_loop'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler.rb:416:in `block (3 levels) in start_threads'
/usr/lib/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'

Everything is working well except when I try to add the email for Redmine, can anyone please send a link or a guide how to setup the email we are using office 365 to be used as a relay not shared mailbox but a regular mailbox.

Thank you