Emails goes to SPAM

Am sending an email on my kvm that host my php application with email account hosted on a different server. Have spent the last couple of days to fix this but no success yet. Please help. ARC-Authentication-Results: i=1; mx.google.com; spf=neutral (google.com: 162.144.xxx.xxx is neither permitted nor denied by best guess record for domain of adventle@162-144-xxx-xxx.example.net) smtp.mailfrom=adventle@162-144-xxx-xxx.example.net Return-Path: Received: from 162-144-xxx-xxx.example.net ([162.144.xxx.xxx]) by mx.google.com with ESMTPS id 68si4739404pfq.172.2018.04.28.19.27.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 28 Apr 2018 19:27:34 -0700 (PDT) Received-SPF: neutral (google.com: 162.144.xxx.xxx is neither permitted nor denied by best guess record for domain of adventle@162-144-xxx-xxx.example.net) client-ip=162.144.xxx.xxx; Authentication-Results: mx.google.com; spf=neutral (google.com: 162.144.xxx.xxx is neither permitted nor denied by best guess record for domain of adventle@162-144-xxx-xxx.example.net) smtp.mailfrom=adventle@162-144-129-117.example.net Received: from adventle by 162-144-xxx-xxx.example.net with local (Exim 4.89_1) (envelope-from ) id 1fCc3p-0000FZ-OK for someusr@gmail.com; Sun, 29 Apr 2018 02:27:33 +0000 Date: Sun, 29 Apr 2018 02:27:33 +0000 To: someusr@gmail.com From: some user Reply-To: basante@domain.com