On 6 April 2020 14:35:04 CEST, Ashley Dixon <[email protected]> wrote: >Hello, > >After many hours of confusing mixtures of pain and pleasure, I have a >secure and >well-behaved e-mail server which encompasses all the features I >originally >desired. However, in the event that I need to reboot the server >(perhaps a >kernel update was added to Portage), I would like to have a miniature >mail >server which catches incoming mail if, and only if, my primary server >is down. > >I have Gentoo installation on an old Raspberry Pi (model B+), and was >curious if >such a set-up was possible ? I also want the solution to be as minimal >as >possible. I see the problem as three parts: > >(a) Convincing the D.N.S.\ and my router to redirect mail to the >alternate > server, should the default one not be reachable; > >(b) Creating the alternate mail server to be as lightweight as >possible. I'm >not even sure if I need an S.M.T.P.\ server (postfix). Would >courier-imap do > the trick on its own (with courier-authlib and mysql) ? > >(c) Moving mail from the alternate server to the main server once the >latter >has regained conciousness. I realise this is a slightly different >problem, and >is not even necessarily _required_ for operation, although it's >certainly a > nice-to-have. > >What do you think; is this at all possible ? Has anyone here done >anything like >this before ? > >Thanks in advance.
You'd need to install a SMTP server on the backup system and configure it to relay emails to your primary mailserver. In the DNS you can configure priorities in the MX entries. -- Joost -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
