This called SPAM?

I have a pre-sales question from someone. He said he want to transfer his domain to my host but he own a safelist. This safelist has over 1,500 members and on average it sends out about 100,000 emails per day. I know this could be a problem for my server, but i'd like to know this is a SPAM or not? Should i go ahead and sign him up?

Thanks in advance!

 

 

 

 

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