Hi Wietse, Ah, seems you were right after all: most bugs are indeed solved by reading the manual ;)
Anyway, I think now I understand what's going on. The distribution that I use (Fedora 12) left those two settings to their default. In this specific case the setting of 5 IP's just isn't high enough, since this host has 22 IP addresses, 11 of which are IPv6. So after trying the first 5 (all IPv6), postfix hasn't tried any IPv4 address yet. I see in the documentation that I can actually disable this limitation. Is there a good reason why I shouldn't want to do this? Any kind of denial of service attack that disabling this limit would make possible? Kind regards, Erik. On 03/04/2010 10:27 PM, Wietse Venema wrote: > Erik Logtenberg: >> Hi, >> >> I noticed that Postfix doesn't fall back on other IP addresses >> associated with a certain MX-server when it fails to accept mail, but >> only uses the firs IP address it finds. If that fails, Postfix will move >> on to the next MX-server, but won't try any other available IP addresses >> for each of the MX-servers. > > Do show concrete evidence, please, as requested in the mailing > list welcome message. > > As distributed by me, Postfix tries up to $smtp_mx_address_limit > (default: 5) server IP addresses, and it stops after > $smtp_mx_session_limit (default: 2) SMTP sessions. > > Note: that is five IP addresses and two sessions. > > Of course it is possible that some distributor modifies Postfix to > enforce their personal preferences on all users, but that is not > my problem. We still have a choice of operating systems. > > Wietse
