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Description of problem:
When you remove sendmail it also removes /etc/aliases.db.
When you install fc6 and then use system-switch-mail and switch to postfix.
When you remove sendmail it removes /etc/aliases.db
So then postfix is without /etc/aliases.db
You have to remember to run newaliases to put it back.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
2.system-switch-mail to postfix
3.rpm -e sendmail
/etc/aliases.db is gone
Should either not remove the file or run newaliases if it exists.
I have seen this for a while on older versions of Fedora.
You have to remember to run newaliases or postfix doesn't work very well.
Please have a look at sendmail-8.14.1-4.1.fc6 in FC-6-testing.
Fixed in updates in package sendmail-8.14.1-4.1.