If you have just set up email on a domain for the first time, you need to build trust and a good reputation with email providers before sending mass campaigns from it. It is not difficult, but the process takes some time.

If you send a thousand emails from a new domain in one day right away, email providers will treat that volume with suspicion: some will deliver your campaign to spam, and some will reject it at the technical level and block the domain.

To avoid this, you need to gradually increase the volume of email sent day by day. Different providers such as Yahoo and Gmail may react differently to how fast you ramp up. Here is an example of an average schedule per provider:

  • Day 1 — 100 emails
  • Day 2 — 200 emails
  • Day 3 — 400 emails
  • Day 4 — 700 emails
  • Day 5 — 1500 emails
  • Day 6 — 3000 emails
  • Day 7 — 5000 emails
  • Day 8 — 10000 emails

If your contact list has 100 addresses at Yahoo and 100 at Gmail, you can send 200 on the first day (100 to each), because reputation is built separately with each provider.

Google supports a gradual approach to increasing campaign volume in its sender guidelines.

It is also important that your audience engages with your emails—opens them and clicks links. The more “active” your campaign is, the sooner you will be able to send more.