It depends on several factors, but here is what we recommend:

Use a dedicated IP, if:

• You are sending more than 50k email per week, in order to isolate your reputation.

Use a shared IP, if:

• If you are sending less than 5,000 messages a day, a shared IP may be the right solution for you.

• Your email sending is volatile with large spikes of volume, may assume those large spikes are spam.

Use a pool of dedicated IPs, if:

• You are a high volume sender, limit the total volume per IP per hour.

• To separate IPs for your bulk and transactional mail.