# Net::SMTPServerBusy exception

**URL:** <https://meta.discourse.org/t/net-smtpserverbusy-exception/264200>\
**Category:** Self-hosting\
**Tags:** notifications, email\
**Created:** [May 8, 2023, 5:39am UTC](https://meta.discourse.org/t/net-smtpserverbusy-exception/264200 "2023-05-08T05:39:50Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![Hyan](https://avatars.discourse-cdn.com/v4/letter/h/5fc32e/32.png) [@Hyan](https://meta.discourse.org/u/Hyan)\
**Post date:** [May 8, 2023, 5:39am UTC](https://meta.discourse.org/t/net-smtpserverbusy-exception/264200/1 "2023-05-08T05:39:50Z")

</div>

I was trying to download website backups from /admin/backups and I cannot receive download emails. After checking production.log I found following output

```plaintext
Started PUT "/admin/backups/xxx.tar.gz" for 203.18.50.6 at 2023-05-08 05:34:50 +0000
Processing by Admin::BackupsController#email as */*
  Parameters: {"id"=>"xxx.tar.gz"}
start
  Rendered text template (Duration: 0.0ms | Allocations: 1)
Completed 200 OK in 658ms (Views: 3.7ms | ActiveRecord: 0.0ms | Allocations: 11718)
  Rendered layouts/email_template.html.erb (Duration: 2.6ms | Allocations: 36)
Job exception: Net::SMTPServerBusy

fail

```

There’s also similar errors related to SMTP, such as below

```plaintext
start
  Rendered user_notifications/digest.html.erb within layouts/email_template (Duration: 26.5ms | Allocations: 3067)
  Rendered layout layouts/email_template.html.erb (Duration: 35.6ms | Allocations: 3335)
  Rendered user_notifications/digest.text.erb (Duration: 19.6ms | Allocations: 2594)
Job exception: Net::SMTPServerBusy

Job exception: unexpected return

fail

```

The site was migrated from an old other site, and there’re many users email formatted as  
**909471255bcde5900c628c6@email.invalid**

Can someone give me a clue what’s the cause of the issue and how can I resolve that?

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_[View the full topic](https://meta.discourse.org/t/net-smtpserverbusy-exception/264200)._