[exim] quick question to ipv6 and "not a valid ip address fo…

Hi,

i have a ipv6 ip running, which starts with 2a02:....

as soon as i set a "interface = 2a02:........."  in the remote
transport, it get this:

R=remoteusers T=remote_smtp defer (-1): "2a02" is not a valid IP address
for the "interface" option for remote_smtp transport

exim cuts the ip to the first block.

Is there any special syntax for ipv6 ips to give in that option or do we
need BOTH, an ipv4 and an ipv6 ip together on a 4/6 system?

best regards,
marius