Arun: >I see that there are many formats to use for lookups. > >I see for exanple this > >... > >smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_scache >smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_scache > >alias_maps = hash:/etc/aliases > >... > >in one example doc. > >I can understand that there ARE diferences. I do not understand >when to use which one.
In that case, I suggest that you use what is shown the examples. Every type (hash, btree, lmdb, and so on) presents a compromise between different requirements. If you're looking for a guide, use the Postfix documentation. Wietse