Suppose, I have a primary MX: mx1.abc.com with priority 5 and secondary mx as mx2.abc.com with Priority 10. I have independent IMAP/POP servers configured to fetch email for abc.com domain. (imap.abc.com & pop3.abc.com)
Suppose mx1.abc.com goes down, is it possible for mx2.abc.com to deliver emails to imap/pop3.abc.com and finally to users of abc.com ?
As per my understanding, secondary MX just holds the queue and forward those emails to primary mail server as soon as it gets up.
Is it really possible ?
Please clear my confusions with technical ideas. I'd love to get answers on or at least receive some hints. :-)