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

[Robin36381]

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.

 

[probus]

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

 

[teechar]

Hello,

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

Are there any grammatical errors in these sentences?

Yes, see below.

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.

 

[emsr2d2]

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