#12 — Comma as delimiter in CSV format for subscribers is suboptimal

The currently used comma as a delimiter in the CSV format for subscribers is highly suboptimal since it can easily occur in names like "Joe Foo, Jr." or in company names including department descriptions, like "Siebens Healthcare".

I suggest using a semikolon, instead, which is much less likely to cause issues with such entries. Also, it would potentially allow to include multiple email addresses, seperated by commas, in a single entry, just in case.