Converting sendmail .db files to text

If you want to inverse the work of newaliases, you can use makemap to convert them to text:

makemap -u hash access.db

This is quite handy to see if the newaliases indeed put all information into the db file (for instance if you use a script, you can verify it ran correctly).

It works for any db, but you need to be aware of the database format: hash type or btree type.

To my knowledge only one uses the btree type format:

• userdb.db

All others use hash type format:

• aliases.db
• aliases-maillist.db
• mailertable.db
• genericstable.db
• virtusertable.db
• access.db
• auth-info.db
• domaintable.db

–jeroen

via: Reading Sendmail .db files.