Ondrej Zajicek:
Note that confederations in BIRD are a bit tricky. There are two styles:
1) Shared IGP: In this case, intra-confederation EBGP links should have an option 'gateway recursive', so bgp_next_hop is resolved recursively through shared IGP routes.
i see, i thought EBGP with a confederation peer would use recursive next hop resolution by default (since NEXT_HOP is propagated unchanged in this case, like in IBGP), but if not, this could be related. i will configure 'gateway recursive' explicitly on my peerings and see if this makes any difference. (i don't use 'next hop self' since my IGP covers the entire network.)
I received that, sorry for not replying earlier. Will check that.
no rush at all, i was only wondering because i know sometimes mail delivery from non-Google/Microsoft addresses can be an issue these days.