While these days quick wins in Correspondence Chess are rare, they aren't completely unheard of. At the non championship level, players are happy to do without engines, relying upon their analysis and judgement. Of course this sometimes goes wrong, and like in over the board chess, the results can be catastrophic.
Williams,J. M. P (1763) - Deacon,Graeme (1857)
AUS/2016/S4201 (AUS) ICCF, 05.09.2016