Translation of Sicherheitsleistung

It means a lot to me to participate and meet other people in this Internet forum. I'll know later if I can move my appointment in order to get together with our visitors from Canada.
Once you've put it online, I'd like to check the text for eventual inconsistencies. Let me know how it goes. So that I can review it as well. Let us be in touch towards our next study session. I will be there on Wednesday.
I think it is better to send an e-mail. Unfortunately, I have not received any response from you. I have answered your last letter a month ago. I would like to correct your mistakes.