It has been over ten days since I sent you the email ...

Hello

Are there any grammatical errors in these sentences?

It has been over ten days since I sent you the email regarding opportunities to volunteer in your company. Since I have not received a response from you. I assume there is no volunteer opportunities. Please put me on your wait list and inform me when opportunities arise.

Since it's a formal letter, you'd better use "there are" rather than "there is".

Robin36381 said:

Hello,

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There's no need to start your post with a greeting. Just ask your question.

Robin36381 said:

Are there any grammatical errors in these sentences?

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Yes, see below.

Robin36381 said:

It has been over ten days since I sent you the email regarding opportunities to volunteer in your company.
Since I have not received a response from you, I assume there are no such is no volunteer opportunities.
Please put me on your wait list and inform keep my details and let me know when suitable opportunities arise.

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I'd say "It's been over ten days since I sent you an email ...".