My ISP aa.net.uk offers Reverse DNS and block of IPv4 /30 or /29 …
- Will it be viable to run MIAB on that connection?
My speed is 80/20 as I am next to FTTC cabinet, possibly being upgraded to G.fast or even FTTP
Hardware will be headless OptiPlex Micro with 128GB SSD + 2TB HDD and 4GB RAM
- Would it be possible to have “/home/user-data/” located on the 2TB HDD drive?
Yes and yes. Read the install instructions concerning setting a custom STORAGE_ROOT location.
Advanced: To change the default location where Mail-in-a-Box stores all of its data, you can set an environment variable named ‘STORAGE_ROOT’ before running the setup script.
Also - Please be sure your ISP supports both inbound and outbound SMTP. Some home ISP’s will block those ports to prevent spam.