Add warm-up / throttled sending for large email campaigns

[rahulkumarsingh73690]

When sending emails to a large subscriber list (e.g., 50,000+ recipients), it would be extremely helpful to have a built-in warm-up / throttling feature to improve deliverability and reduce the risk of being flagged as spam.

Currently, sending to a large list at once can negatively impact sender reputation, especially for new domains or IPs.

Proposed Feature:

Introduce flexible sending controls such as:

• Ability to limit daily send volume (e.g., 5,000 emails/day)

• Option to gradually increase sending volume over time (automatic warm-up)

• Custom scheduling like:

  • Send X emails per hour/day
  • Define ramp-up strategy (e.g., 1k → 3k → 5k → 10k)

• Queue-based sending system for large campaigns

• UI to monitor progress (sent / pending / failed)

Use Case:

For example, if a user has 50,000 subscribers:

• Day 1: send 2,000 emails
• Day 2: send 5,000 emails
• Day 3+: gradually increase until full capacity

This helps:

• Maintain high inbox placement
• Avoid spam filters and rate limits
• Protect domain/IP reputation

Expected Benefits:

• Better email deliverability
• Safer large-scale campaigns
• More control for users handling big lists
• Useful for both new and experienced senders

Additional Notes:

This feature would be especially valuable for:

• New users warming up domains
• SaaS tools sending newsletters or updates
• High-volume campaigns

[andrianvaleanu]

Sending thousands of emails at once is a quick way to get blocked by ISPs. Throttling is really the only way to stay safe when you're scaling up.

Testing your setup with https://unspam.email/ can show if your technical records are solid.

[fabwnb]

This is a very good feature and is needed. Hope it can be developed soon.