No DBM Aliasing
Some versions of Unix do not provide the libraries that are needed to compile sendmail with database support. When neither the db(3) nor ndbm(3) library is available, and when no other method for getting aliases is declared (such as nis), sendmail keeps aliases in its internal symbol table.
When the symbol table is used, sendmail reads the aliases text file only once, when sendmail starts or is forked as a child. If the aliases text file changes, a running daemon will not automatically recognize that change. Instead, the daemon must be killed, and restarted, before it can use any new aliases text file entries.
In general, we discourage you from running sendmail in daemon mode without external aliases database files.
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