> This works because the Postfix SMTP client randomizes the order of
> equal-preference IP addresses.
On Thu, 19 Mar 2026 19:51:03 +0000
Bluejay Adametz via Postfix-users <[email protected]> wrote:
Is the question about balancing between _your_ SMTP servers, or are you looking
at how the SMTP servers you're sending mail _to_ might be load balanced?
If the former, the question has a broader scope than what the postfix SMTP
client does. If the latter, then Wietse's answer covers it.
On 19.03.26 22:38, Sad Clouds via Postfix-users wrote:
2. Mail submission by MUAs.
3. IMAP access by MUAs.
All of them should load balances correctly across replica SMTP and IMAP
servers. DNS round-robin seems to be good enough for this and avoids
complex load balancing proxies.
With DNS round-robin your users will complain whene either one of IP
addresses is unreachable. Long time ago we (at my former job) left this way
and moved to load-balancer.
Some load balancers support clustering, so they can move sessions to another
device should you reboot either.
--
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