> > You advice is well received and the linked HOWTO is excellent. However, I > > don’t know if I want to move to postfix, is ther eany reason to do this, and > > if I don’t, what would be different in configuring sendmail to deliver to > > the dovecot maildir format? > > This means that if you suffer a dictionary email attack and you bounce > mis-addressed email, you could end up with a million outgoing messages > in your queue. > > This might sound far fetched, but I have three domains which receive > close to 30k emails a day to users who do not exist. Some other mail > servers, like Courier, look at the addressee of incoming email and do > not accept the email if the user does not exist. > > Can you block the dictionary attack by cutting off the server? Probably > not this attack since I get no more than 25 pieces from any one host! > This is a very distributed attack What about dropping the messages if no such user exists? Is there a way to do that within Postfix? I wouldn't think that mail would want to be working in that fashion, but...maybe there's a way? eric -- Eric Wagar eric@xxxxxxxxxxxxxxx -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
