1. My ISP send me a router that has a feature to host a internet accessible fileserver. Out-of-the-box. ISPs in germany do not promote home-hosting but they giv

1. My ISP send me a router that has a feature to host a internet accessible fileserver. Out-of-the-box. ISPs in germany do not promote home-hosting but they give you devices that do it. 2. Incoming / Outgoing TCP/25 blocking: Not a problem with ISPs in Germany. 3. Blacklisting: At most a problem if you send mails. Plus GMAIL requires SPF/DKIM for just about evey IP, so yes, you are on a blacklist unless you do some DNS magic. BUT once you do the magic it will override IP block - unless the other side has a shitty setup....