How to setup next hop only for ipv4?

[jotonedev]

My ISP allows smtp on port 25 only when using IPv6. So for IPv4 I have a relay but that has limits on how many smails you can send.
I want to use the smtp relay only for ipv4 and for ipv6 directly send the emails.
How can I configure that?

[mdecimus]

Currently you can do that by creating an IPv4 rule that matches the high bit of IPv4 address using a /31 mask. But since this is not practical I have just committed an enhancement that will allow you to match IPv6 addresses as ::/0 or 0000:0000:0000:0000:0000:0000:0000:0000/0 and IPv4 addresses as 0.0.0.0:/0:

So in your scenario you'll be able to do this:

next-hop = [ { if = "remote-ip", eq = "0.0.0.0/0", then = "relay" }, 
              { if = "rcpt-domain", in-list = "local/domains", then = "local" }, 
              { else = false } ]

This enhancement will be included in the new release scheduled for next week.

[mdecimus]

Sorry, my bad. The remote-ip key is only available once the next-hop has been obtained as it contains the IP address of the host to deliver the message two. I'll think of possible alternatives and will let you know this week.

[jotonedev]

I think a solution would be to add support for fail-over relay.

[jotonedev]

Sorry, my bad. The remote-ip key is only available once the next-hop has been obtained as it contains the IP address of the host to deliver the message two. I'll think of possible alternatives and will let you know this week.

@mdecimus

I'm sorry if I seem too pushy, but is there any update on this?

[mdecimus]

I am currently working on the antispam module, I'll look into this enhancement as soon as the next version is released (in about 1 or 2 weeks hopefully). I am planning to replace rules with expressions which are going to be more powerful than rules. I'll take this change into consideration.