SMTP Error (451) - Temporary lookup failure

[Francois Martin]

Hello,

I just follow the procedure to make the Kolab multi-domain server with the following pages:
https://docs.kolab.org/howtos/multi-domain.html#amavisd-changes
http://kolab.org/blog/cornelius-hald/2015/01/05/kolab-3.3-multi-domain-setup-centos-7

I can connect with users in new domains and send mail locally.

When I try to send mail to the outside, the following error message appears in the webmail:
SMTP Error (451): failed when adding the recipient "admin at mail.zimbra.com" (4.3.0 <admin at mail.zimbra.com>: Temporary lookup failure)

What should I do to correct this?

thank you in advance ! :-)
Martin
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