Join Data Into Single Cell As Comma Seperated

I am attemping to transpose a column of data into a single cell. I have a list of contact information, and one of the columns is for e-mail addresses. There are filters to the right of the data with different categories so the contact information can be filtered according to the different criteria. Ultimately, the people using the spreadsheet want to use those filters to create a list of e-mail addresses to send their distributions to.

The people who are using this don't have Outlook so we can't use an output to add them to the Outlook address book. We would like to make one cell at the bottom of all the data which would include all the e-mail addresses from that column seperated with a semi colon so they can just copy the contents of that cell and paste that into the To: field on their e-mail program. I've tried several different things but I've not been able to find a solution.