A question on spamming

I have am thinking about opening a craft forum in the future and was wondering would this be classed as spam?

I was going to go to indivicual sites who do craft and send them a one off email and ask if they would be interested in taking part in the forum? Rather than send everyone their own little email though i thought i could just add them to a database, fire off the emails and then delete the database.

Is that ok as it is related to what they do and wopuld be a one off?

Thanks

 

 

 

 

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