Hi Andreas
list.scout.ch. is not the same as aleka.scout.ch You could do instead
Yes, but this has been this way for months and has never caused an issue yet. Not even with @bluewin.ch recipients. So did bluewin change something?
Well I'll change the MX. Let's see if this solves this issue.
Strange that IMP has no such issue. We also have MX that point to IP's resolve to other names to do DNS based load balancing.
rrmx.imp.ch has address 157.161.12.5 rrmx.imp.ch has address 157.161.12.4 rrmx.imp.ch has address 157.161.12.6 rrmx.imp.ch has IPv6 address 2001:4060:1:1001::12:4 rrmx.imp.ch has IPv6 address 2001:4060:1:1001::12:5 rrmx.imp.ch has IPv6 address 2001:4060:1:1001::12:6
5.12.161.157.in-addr.arpa domain name pointer obelix.imp.ch.
and so on.