I had  a configuration with

smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

I saw in the logs

postfix/tlsmgr[8777]: warning: /var/lib/postfix/smtp_scache: hash/btree support is deprecated.  Please switch to cdb or lmdb.

Thus I changed to

smtp_tls_session_cache_database = cdb:${data_directory}/smtp_scache

and removed the file

Then I had error

postfix/tlsmgr[16031]: fatal: table cdb:/var/lib/postfix/smtp_scache: sequence operation is not supported

So its clear I made an error by following a bit too blindly the warning message.

/usr/share/doc/postfix/NON_BERKELEYDB_README.gz does not mention the cache database (postfix 3.11-5, debian testing)


Following https://www.postfix.org/TLS_README.html I commented out the configuration, and it works, thus no problem, but I am curious of what I missed


--
Erwan David
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