OT: set sendmail client IPv6 address

Julian Field MailScanner at ecs.soton.ac.uk
Thu Mar 5 21:38:51 GMT 2009

Just found the answer to this after mailing this list.
CLIENT_OPTIONS(`Family=inet6, Addr=<ipv6-address>')
is the answer, for anyone else who's interested.

On 5/3/09 20:47, Julian Field wrote:
> Apparently Postfix has an option "smtp_bind_address6" which sets the 
> IPv6 source address of outgoing SMTP connections.
> This is useful if your Postfix server has, like many IPv6-configured 
> boxes, more than 1 IPv6 address.
> Can you do the same in sendmail?
> If so, how?
> In RedHat 5 and presumably CentOS 5, you always get a global IPv6 
> address based on the MAC address of the ethernet card combined with 
> your local IPv6 subnet.
> We always add another global IPv6 address based on the machine's role 
> as well, so that their IPv6 addresses in the DNS don't depend on the 
> MAC address of the ethernet card. Sensible if you don't want to have 
> to update your DNS just because a network card dies.
> So how do I either
> a) Stop RedHat 5 + CentOS 5 creating a global IPv6 address based on 
> the MAC address,
> and/or
> b) Set the source IPv6 address of client SMTP connections my mail 
> server makes to the outside world
> ?
> All ideas welcome!
> Cheers,
> Jules.


Julian Field MEng CITP CEng
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