Email Marketing & Newsletter — Queue, rate limit and cron
Follow browser processing, autonomous cron continuation, global rolling-window throttling, locking, stale recovery and SMTP delivery rules.
Process a newsletter in the browser
Process a newsletter in the browserAllow the campaign page to request immediate queue work in small chunks.Admin Area → Letter Manager → Email Marketing / Newsletter → Active campaign progress
Open guide →GuideContinue newsletter delivery through cron
Continue newsletter delivery through cronUse the module after_cron_run hook so queued campaigns progress after the browser closes.Admin Area → Setup → Cron Job, then Admin Area → Letter Manager → Email Marketing / Newsletter → History
Open guide →GuideUnderstand the 100 emails per five minutes limit
Understand the 100 emails per five minutes limitApply the exact global rolling-window rule enforced by the queue.Automatic queue control → Browser processing and CRM cron
Open guide →GuideUnderstand newsletter queue locking
Understand newsletter queue lockingPrevent browser and cron workers from processing the same queue simultaneously.Automatic queue control → MySQL campaign queue lock
Open guide →GuideRecover stale processing recipients
Recover stale processing recipientsUnderstand the automatic recovery of rows left in processing by an interrupted worker.Automatic queue control → Next browser or cron queue run
Open guide →GuideUnderstand sender identity and personalised greeting
Understand sender identity and personalised greetingKnow the sender fallback and fresh CRM name lookup used for each outgoing message.Automatic queue delivery → SMTP
Open guide →GuideUnderstand newsletter send success and failure
Understand newsletter send success and failureReview how each SMTP attempt changes recipient and campaign evidence.Admin Area → Letter Manager → Email Marketing / Newsletter → History → Details
Open guide →GuideClose the newsletter page safely
Close the newsletter page safelyLeave the browser without cancelling the server-side campaign.Admin Area → Letter Manager → Email Marketing / Newsletter → Active campaign progress
Open guide →GuideUnderstand oldest queued campaign selection
Understand oldest queued campaign selectionKnow which campaign autonomous processing chooses when no campaign ID is requested.Automatic queue control → CRM cron
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