Hi,
I have been using swiftmailer for a while, and it is truly a great tool! However, some rather important emails - such as order confirmations - still get caught in spamfilters, despite following the tips given on the web site.
One way to reduce the probability of being flagged as spam is to include a hashcash stamp (http://www.hashcash.org). Basically, you spend a small amount of processing time to convince the mail server on the other side that you are not a spammer.
Since many server-side spam filters (esp SpamAssassin) now support hashcash out of the box (reducing your spam score), it would be great to have optional hashcash support integrated into swiftmailer.
Cheers,
Batrick
Hashcash Support
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