How to set Email sending speed limit?

neounix · December 8, 2020, 12:54am

Hey Josh!

For digests you can limit this to 14 per second by setting this Discourse global to 420, as follows in your container build file:

 DISCOURSE_MAX_DIGESTS_ENQUEUED_PER_30_MINS_PER_SITE: 420

This is not “exactly” what you want but it is darn close.

Since 14 per second (from your post) times 30 seconds = 420, this global setting will limit digests to around 420 per every 30 minutes, just like the code “says”:

discourse/discourse/blob/main/app/jobs/scheduled/enqueue_digest_emails.rb#L37


      
              .where(
                "COALESCE(user_options.digest_after_minutes, ?) > 0",
                SiteSetting.default_email_digest_frequency,
              )
              .where("user_stats.bounce_score < ?", SiteSetting.bounce_score_threshold)
              .where("user_emails.primary")
              .where(
                "COALESCE(user_stats.digest_attempted_at, '2010-01-01') <= CURRENT_TIMESTAMP - ('1 MINUTE'::INTERVAL * COALESCE(user_options.digest_after_minutes, ?))",
                SiteSetting.default_email_digest_frequency,
              )
              .where(
                "COALESCE(last_seen_at, '2010-01-01') <= CURRENT_TIMESTAMP - ('1 MINUTE'::INTERVAL * COALESCE(user_options.digest_after_minutes, ?))",
                SiteSetting.default_email_digest_frequency,
              )
              .where(
                "COALESCE(last_seen_at, '2010-01-01') >= CURRENT_TIMESTAMP - ('1 DAY'::INTERVAL * ?)",
                SiteSetting.suppress_digest_email_after_days,
              )
              .order("user_stats.digest_attempted_at ASC NULLS FIRST")
          
          # If the site requires approval, make sure the user is approved

Naturally, if your SMTP channel is sending other emails, you will need to adjust this down; or you can set up a different, separate channel for digest emails (like we do).

Note: This global setting is set to 10,000 per 30 minutes by default; which is a lot of digests per hour if you ask me ;). So, we set this much lower so we have a “reasonable” SendGrid bill each month.

30 digests per 30 minutes = 1440 per day, or around 43,200 per month (because we were sending a lot of digests before I made this change a few days ago). Next month, I will bump this up to around 60 digests per 30 minutes, or around 86,400 digests per month plus or minus.

Hope this helps.

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How to set Email sending speed limit?

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