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Im trying to clean up the mess left by sendmail, My unix knowledge is extremely limited so I would appreciate some help with whether these packages are safe to remove, I have already run apt-get purge sendmail*

and when I run apt-get remove --auto-remove sendmail these packages are still left over, Im worried that removing them will break something else from working.

The following packages will be REMOVED:
  liblockfile-bin liblockfile1 libsigsegv2 m4 procmail
0 upgraded, 0 newly installed, 5 to remove and 0 not upgraded.

This is pretty much a fresh dedi set-up and I've just gone through securing it, so there arnt that many things installed that could be upset. This will be production, so I would like to know if these packages are safe to remove though.

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Using apt-get autoremove gives you the advantage to get rid of all packages not needed as dependencies anymore, not just related to the ones of sendmail. Quoting the manpage:

autoremove is used to remove packages that were automatically installed to satisfy dependencies for other packages and are now no longer needed.


By the way: If you like clean systems (I do!), have a look at deborphan. Quoting the description:

deborphan finds "orphaned" packages on your system. It determines which packages have no other packages depending on their installation and shows you a list of these packages. It is most useful when finding libraries, but it can be used on packages in all sections.

This package also includes orphaner, a text menu frontend to deborphan. Please install the recommended packages dialog, gettext-base and apt when you want a working and fully featured orphaner.

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