why are my transactions sent without fees?

[miernik]

When I send transactions (from 0.6.2.2 client), when I look at them on http://blockchain.info/ they have no fees.

Isn't that strange, I thought all transactions now require a 0.0005 fee?

I don't have anything about fees in my ~/.bitcoin/bitcoin.conf

The client is from the Debian repository, daemon.

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[Meni Rosenfeld]

Not all transactions, just low-priority ones.

[gmaxwell]

Isn't that strange, I thought all transactions now require a 0.0005 fee?

Why did you think that?  The overwhelming majority of transactions sent by regular users don't need fees.

Fees are only required when your txn is not distinguishable from a DOS attack by the system.

[randomproof]

If you are using the standard client, it will prompt you to include a fee if it thinks it is needed.  It is possible to edit the code and not include this "required" fee, but then the transaction may not propagate on the network to miners.  If you see your transaction on http://blockchain.info/ than it is safe to say that it will get entered into a block eventually. (Well, 98% sure)