On 20 Nov 2017, at 12.54, Stephan von Krawczynski <skraw.ml@ithnet.com> wrote:
If I had lets say 10 nodes handling incoming SMTP and delivery to local maildirs in parallel and independantly on a network storage and imapping this from another independant 4 nodes, then building a not needed bottleneck by shifting over the local delivery via director and LMTP to fewer nodes is just braindead creation of high loads on few boxes.
And btw it scales perfectly because all that is needed if load increases is up'ing additional nodes for SMTP/delivery or IMAP _which are all the same (of two types)_.
The loadbalancer needed for this can be equally used for e.g. web, ftp and other services. So there is absolutely no extra stuff needed for the mail setup.
Thanks for the info. But I was more after some real performance figures such as LMTP deliveries per second, IMAP logins per second or number of concurrent IMAP connections or mails FETCH/sec.
Sami