Synology Server assistance

Description

I need some remedial work completed on my synology fixed server.
After replacing my router I am getting an error message with my DNS server - although I can still access the system remote log on is difficult - I also would like the e mail server setting up.
To someone who knows what they are doing I would think this might be a couple of hours work connecting remotely - becuase I run a small business from home and the data is senstive I will ask for a NDA to be signed in advance