Email notifications arrive in incorrect sequence

Bug
1

Reproduce:

  1. Ensure email notifications are on for User A for a given topic, such that User A receives an email notification for every reply to that topic. (Or, every post in a category.)
  2. Have User B reply to the topic.
  3. Immediately after (1-2 minutes, or within the editing window established), have User C reply to the same topic.

Expected results:

  • Email notification from User B arrives before the notification from User C.

Actual results:

  • Email notification from User C may arrive before the notification from User B.
2

Email delivery is generally not guaranteed to preserve submission order. This is an inherent property of SMTP and not something Discourse could influence.

Check the timestamps on the two emails; the Date header should show when the emails were submitted, Delivery-date when they were delivered to the receiving user’s mailbox.

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