SpamHero is an excellent solution for customers at DreamHost that want premium spam filtering. To ensure that no messages are lost while activating SpamHero with DreamHost, it is very important that you follow the instructions that DreamHost provides on the following page:

https://help.dreamhost.com/hc/en-us/articles/215832878-How-do-I-use-an-MSP-with-DreamHost-
Double check that you have your DreamHost settings correct as follows:

Note: If you are also using DreamHost AntiSpam, you must also follow these instructions:

https://help.dreamhost.com/hc/en-us/articles/215832878-How-do-I-use-an-MSP-with-DreamHost-#Extra_step_needed_for_Anti-Spam_users