Ganael Laplanche:
> Hello,
> 
> Maybe I am missing something but I cannot find a way to silently ignore a 
> failing dictionary in a chain, such as:

There is no such feature.

> virtual_alias_maps =    ldap:/etc/postfix/myldap.cf,
>                         hash:/etc/postfix/mymap

Ignoring errors would result in misdelivery of email. You may have
expectations that it is OK for software to randomly misdeliver
email, but that is not how Postfix works.

If LDAP cannot handle many concurrent connections, use proxymap
like everyone does with mysql and the like, or hide it under 
a memcache_table.

http://www.postfix.org/proxymap.8.html

    virtual_alias_maps = proxy:ldap:/etc/postfix/myldap.cf,
                         hash:/etc/postfix/mymap

http://www.postfix.org/memcache_table.5.html

    virtual_alias_maps = memcache:/etc/postfix/memcache-aliases.cf

        Wietse

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