Cannot Send Digest Emails: Jobs::UserEmail Deprecation Notice / No Emails After Enqueue via Rails

Support
,
1

Unable to send digest. Digest are enqueuing but not sending in real. I can’t see any email log.

  • I see digest jobs enqueued in Sidekiq
  • No actual digest emails are sent
  • Each job logs:
Deprecation notice: Jobs::UserEmail was enqueued with argument values which do not cleanly serialize to/from JSON. This means that the job will be run with slightly different values than the ones supplied to `enqueue`. Argument values should be strings, booleans, numbers, or nil (or arrays/hashes of those value types). (deprecated since Discourse 2.9) (removal in Discourse 3.0)
  • No SMTP or Sidekiq process issue is present
  • All non-digest emails (and test emails) send and deliver correctly

Here is full error log
Info:

[privateinvestigator] Deprecation notice: Jobs::UserEmail was enqueued with argument values which do not cleanly serialize to/from JSON. This means that the job will be run with slightly different values than the ones supplied to `enqueue`. Argument values should be strings, booleans, numbers, or nil (or arrays/hashes of those value types). (deprecated since Discourse 2.9) (removal in Discourse 3.0) 
At (discourse):89:in `block (3 levels) in <main>`

Backtrace

activesupport-8.0.3/lib/active_support/broadcast_logger.rb:218:in `block in dispatch' 
activesupport-8.0.3/lib/active_support/broadcast_logger.rb:217:in `map' 
activesupport-8.0.3/lib/active_support/broadcast_logger.rb:217:in `dispatch' 
activesupport-8.0.3/lib/active_support/broadcast_logger.rb:129:in `warn' 
/var/www/discourse/lib/discourse.rb:1053:in `deprecate' 
/var/www/discourse/app/jobs/base.rb:407:in `enqueue' 
(discourse):89:in `block (3 levels) in <main>'
activerecord-8.0.3/lib/active_record/relation/batches.rb:88:in `each' 
activerecord-8.0.3/lib/active_record/relation/batches.rb:88:in `block in find_each' 
activerecord-8.0.3/lib/active_record/relation/batches.rb:172:in `block in find_in_batches' 
activerecord-8.0.3/lib/active_record/relation/batches.rb:461:in `block in batch_on_unloaded_relation' 
<internal:kernel>:187:in `loop'
activerecord-8.0.3/lib/active_record/relation/batches.rb:434:in `batch_on_unloaded_relation' 
activerecord-8.0.3/lib/active_record/relation/batches.rb:289:in `in_batches' 
activerecord-8.0.3/lib/active_record/relation/batches.rb:171:in `find_in_batches' 
activerecord-8.0.3/lib/active_record/relation/batches.rb:87:in `find_each' 
(discourse):86:in `with_index'
(discourse):86:in `block (2 levels) in <main>'
rails_multisite-7.0.0/lib/rails_multisite/connection_management.rb:203:in `with_connection'
rails_multisite-7.0.0/lib/rails_multisite/connection_management.rb:17:in `with_connection'
(discourse):55:in `block in <main>'
(discourse):54:in `each'
(discourse):54:in `<main>'
irb-1.15.2/lib/irb/workspace.rb:101:in `eval' 
irb-1.15.2/lib/irb/workspace.rb:101:in `evaluate' 
irb-1.15.2/lib/irb/context.rb:591:in `evaluate_expression' 
irb-1.15.2/lib/irb/context.rb:557:in `evaluate' 
irb-1.15.2/lib/irb.rb:201:in `block (2 levels) in eval_input' 
irb-1.15.2/lib/irb.rb:512:in `signal_status' 
irb-1.15.2/lib/irb.rb:193:in `block in eval_input' 
irb-1.15.2/lib/irb.rb:272:in `block in each_top_level_statement' 
<internal:kernel>:187:in `loop'
irb-1.15.2/lib/irb.rb:269:in `each_top_level_statement' 
irb-1.15.2/lib/irb.rb:192:in `eval_input' 
irb-1.15.2/lib/irb.rb:173:in `block in run' 
irb-1.15.2/lib/irb.rb:172:in `catch' 
irb-1.15.2/lib/irb.rb:172:in `run' 
railties-8.0.3/lib/rails/commands/console/irb_console.rb:113:in `start' 
railties-8.0.3/lib/rails/commands/console/console_command.rb:59:in `start' 
railties-8.0.3/lib/rails/commands/console/console_command.rb:8:in `start' 
railties-8.0.3/lib/rails/commands/console/console_command.rb:87:in `perform' 
thor-1.4.0/lib/thor/command.rb:28:in `run' 
thor-1.4.0/lib/thor/invocation.rb:127:in `invoke_command' 
railties-8.0.3/lib/rails/command/base.rb:178:in `invoke_command' 
thor-1.4.0/lib/thor.rb:538:in `dispatch' 
railties-8.0.3/lib/rails/command/base.rb:73:in `perform' 
railties-8.0.3/lib/rails/command.rb:65:in `block in invoke' 
railties-8.0.3/lib/rails/command.rb:143:in `with_argv' 
railties-8.0.3/lib/rails/command.rb:63:in `invoke' 
railties-8.0.3/lib/rails/commands.rb:18:in `<main>' 
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
bootsnap-1.18.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require' 
script/rails:8:in `<top (required)>'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in `load'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in `kernel_load'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:23:in `run'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:452:in `exec'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/command.rb:28:in `run'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor.rb:538:in `dispatch'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:35:in `dispatch'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/base.rb:584:in `start'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:29:in `start'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/exe/bundle:28:in `block in <top (required)>'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/friendly_errors.rb:117:in `with_friendly_errors'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/exe/bundle:20:in `<top (required)>'
/usr/local/bin/bundle:25:in `load'
/usr/local/bin/bundle:25:in `<main>'

Have anyone else faced same issue?
How can I fix this?

1 Like
2

@emonunix looks like nobody in the community was able to help answer your question. Sorry about that! Were you able to resolve your issue?

If not, is there anything about your setup that you can tell us? Are you on a self-hosted site set up using the official install instructions? Is your site up to date?

1 Like
3

Hi @tobiaseigen Thanks for following up.
Still facing this issue with digest.
We’re running a Discourse multisite environment and interestingly, some sites send digests correctly to eligible users, while others enqueue digest jobs but never actually send them.

When we trigger digest delivery manually from Rails, it behaves the same way:

  • Jobs appear in Sidekiq → Queued,
  • But no actual emails are sent,
  • And no entries show up in the email logs.

All regular (non-digest) emails like user activation, password reset, and test emails send perfectly fine.

We’re already following the official Discourse setup instructions, and our installation is fully up to date.
The host machine runs Ubuntu 20.04 LTS.

Could you please let me know what specific details or logs we can share to help diagnose this further?

1 Like
4

Did you change any settings related to the digest? Like Suppress digest email after days

1 Like
5

Yes @moin, I tried by increasing decreasing Suppress digest email after days
It didn’t change anything.

1 Like