Warming Up New Email Addresses

Note: there is an ongoing debate within the community about whether or not Gmail and Outlook have gotten smarter about detecting warm-ups. So proceed with caution.

You can use tools "warm up" new email accounts to boost deliverability by using Warmbox or Inbox Warmup.

Warm-ups will start sending emails on your behalf to dummy inboxes. Then those dummy inboxes will reply to those emails, creating a feeling of valid emails occurring from your email address.

Generally, it's best to slowly ramp up sending activity yourself rather than use a 3rd party service. This means sending 5-10 emails/day from a brand new domain/sub-domain and slowly increasing volume towards 50-100/day after 3-6 months.