Spam email apparently coming from a relatively big company

I have an @icloud.com email account and I keep receiving emails that apparently coming from LIDS.

There is no unsubscribe option in the emails. I've visited LIDS website and found that option here. I've used it several times in the last months with no success.

I just sent them an email for this purpose using the contact option in their website.

If I click on the email(I know I'm supposed to ignore them but I don't care at this point) it takes me to the real LIDS website. No spam weird website with malware or anything similar.

Is there a way to know if this emails are really coming from this company? And is there something else I should do, like reporting this to any official org?

Thanks in advance

(Please, feel free to edit this post if it is convenient and/or its tags)

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