I administer an email system which uses a VPS running OpenSMTPD as the
public facing bit.
The VPS relays email to and from a separate OpenSMTPD mail server which is
located on premises. We'll call this the 'local' server.
The local server gets powered down every night, however this currently
causes messages to back up on the VPS or 'public' server. When the local
server comes back online in the morning, I have to log into the public
relay server and use smtpctl to manually resume the route to the local
server. Then a 'smtpctl schedule all' command must be run after which the
backed up overnight email comes pouring in.
This configuration is suboptimal for two reasons
* It generates bounce and 'sending delayed' postmaster messages when the
local server is down
* It requires manual intervention to ensure speedy email delivery to the
local server when it's powered back on.
I've been thinking about adding another OpenSMTPD relay mail server at the
local site, which is low power and can stay running all the time without
issue. But this merely shifts the location of the mail pile-up from remote
to local.
Any mail gurus out there have a solid method for solving this problem?
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