If your server is down, mail delivery is tried every couple of hours for days. So - if your server is down for a day or two, no email should get lost.
Fortunately the server went down very few times, but the last one lasted almost two daysand I lost a lot of mail on multiple mailboxes.Even though I work alone, it is still a business server and I can't afford these things.
then configure a second MX with> the same SMTP and dovecot configuration, then configure replication> between the two dovecot instances. https://wiki.dovecot.org/Replication I had read this page on replication, but I didn't understand how I can access the second server.Roundcube/Thunderbird are configured to access an IMAP / SMTP server that matchestheir respective IP addresses, but here the IPs would become 2x2 = 4 HTTP is another topic. If you also need high availibilty of your> roundcube frontend, then you'd need a reverse proxy/load balancer in> front of your server that can detect the outage and then direct the user> to the other frontend on the second MX. I already have Nginx as Reverse Proxy for Apache on my server.However, if I understand your suggestion, I should install a third server for this purpose only.Isn't there a guide to refer to?I wouldn't even know what to look for on Google? PS: The text part in you email is broken (no line breaks).I do not understand.I am writing from the yahoo webmail.
Many thanksA.