I <i>love</i> Postbox.  It&#x27;s been my primary email client ever since I was forced to switch from Eudora.  It even supports Thunderbird plugins with some small tweaks (mostly just recognising the Postbox User Agent).<p>My biggest complaint about Postbox is that it&#x27;s too cheap.  It&#x27;s only $15... I paid more than that for my Twitter client.  Email is mission critical for me, so I&#x27;m happy to pay at least $50 (maybe $50&#x2F;year?) for whatever is the most efficient, powerful &amp; reliable email client.  I want to pay that money to a company so they&#x27;ll keep developing &amp; advancing the program, not abandon it like Mozilla is doing now.