So I want to build a mailspooler.. Something I can put online when I have to take my mail server down for whatever reason. I'm sure others have done this, so I'm curious if there are any how-tos out there. I suspect this is as simple as spinning up something like a postfix instance, setting it to relay mail to my server, and just stick it out there.
I did some googling around, but I haven't been able to find anything beyond commercial solutions or how-tos for building a full mail server.
Anyone have any pointers?

