el correo termina en la carpeta de spam de Google mientras se pasa SPF, pase DKIM, pase DMARC

el correo termina en la carpeta de spam de Google mientras se pasa SPF, pase DKIM, pase DMARC

Estoy intentando enviar correo básico a un usuario de Gmail de prueba y el correo termina en la carpeta de spam. Realmente no entiendo por qué. Solía ​​enviar a través de ubuntu sendmail, pasé mucho tiempo configurando postfix/dovecot pero todavía termina en spam. ¡Y lo mismo con outlook/live!

He mirado otros posts pero no veo como solucionarlo.

usando Mxtoolbox, no veo ningún problema: https://mxtoolbox.com/dominio/gerant-immo.com/

Los encabezados también parecen estar bien:

ID du message    
Date de création :  27 février 2018 à 16:54 (Temps d'envoi : 0 seconde)
De :    Pierre Mouilhade Message envoyé avec mail (GNU Mailutils 2.99.99)
À : [email protected]
Objet : testing
SPF :   PASS avec IP 54.37.157.157 En savoir plus
DKIM :  'PASS' avec le domaine gerant-immo.com En savoir plus
DMARC : 'PASS' En savoir plus

Delivered-To: [email protected]
Received: by 10.25.142.149 with SMTP id a21csp5148448lfl;
        Tue, 27 Feb 2018 07:54:26 -0800 (PST)
X-Google-Smtp-Source: AH8x225LRChHqPMrsmVBeMzyZ80JcAFNz3ZGdA/iXknZaKJG85qi/B5PgdSHEzHjT1X/51LQc1bQ
X-Received: by 10.223.182.156 with SMTP id j28mr12863054wre.66.1519746866884;
        Tue, 27 Feb 2018 07:54:26 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1519746866; cv=none;
        d=google.com; s=arc-20160816;
        b=uyqDpNd/HSwglqKIzQ34pCAv38Ns0M43dzzFuLhwBz3ImRSGZdxXEH6RaDe9TDKW5L
         /e1K2Ih51KLjH43z2Dker5tmOzSlqSNIFnnFens3b8STr/1r0dnrjKhb0fgmbYYq8Zl3
         TJDa/CcwcBEp/kgfqP52fb/TxX2we1dEOEQLckBxvg4ihDg8gJ4ixf55Byi/QqKtnOrB
         NXrqCY0axq6qlcBQ1vDDbdKgrSTdpWctiMlcJN+IAWGOX8wBYxcw2r9oPlWq5p60h0T3
         vB9o2Fe1INVCZ7GvKPaUcQvhBs6mqH4HLeo7Zg+F9KE+K6ls+i8vyhamUCiw+/mgzZX3
         +B5g==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=from:date:message-id:subject:to:dkim-signature
         :arc-authentication-results;
        bh=nypZpg5l+81aPhtySK35KJDOOjKxnkP7R1HCZXGW3hM=;
        b=I2vwwSB4v0pK6Daa9NsWW7fC222N0hes9UVPHygu1GqtAjIlSaxUqzET158CsuKJQE
         gmKbRA1cQFYXpb6Kq0RhupMNzuaERiiEPWOWNwjh1SsSltCPkZGlotr6VwZjN9C9xN/k
         3O5bxBDZ+CiTVKutAU9RvDji50nWle1kSrb1D7+r/s5OJtJ6tlpAWtWCU9TZvui98sHB
         +o5gaUiCDzPszL9yOJ8tlm6EAlypTmqkAwN15RTk/A4qKO85DYgbQsW/N5j2GAsCPb6E
         yhBO+9tnEQL276GH+maPmAoFr+L3h6eUCflWQTYDVCXt1MuCZXj+jGeVfOKfJRiBNTsy
         OkHg==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass [email protected] header.s=mail header.b=je4Cox0q;
       spf=pass (google.com: domain of [email protected] designates 54.37.157.157 as permitted sender) [email protected];
       dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=gerant-immo.com
Return-Path: 
Received: from gerant-immo.com (gerant-immo.com. [54.37.157.157])
        by mx.google.com with ESMTPS id m2si877353wmh.123.2018.02.27.07.54.26
        for 
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 27 Feb 2018 07:54:26 -0800 (PST)
Received-SPF: pass (google.com: domain of [email protected] designates 54.37.157.157 as permitted sender) client-ip=54.37.157.157;
Authentication-Results: mx.google.com;
       dkim=pass [email protected] header.s=mail header.b=je4Cox0q;
       spf=pass (google.com: domain of [email protected] designates 54.37.157.157 as permitted sender) [email protected];
       dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=gerant-immo.com
Received: by gerant-immo.com (Postfix, from userid 1002) id 7FCE4839C6; Tue, 27 Feb 2018 16:54:26 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gerant-immo.com; s=mail; t=1519746866; bh=nypZpg5l+81aPhtySK35KJDOOjKxnkP7R1HCZXGW3hM=; h=To:Subject:Date:From; b=je4Cox0qlmTJAP6tatdYK8WyrvLALo3kjnjADH+zXsFy+Wp2ZS5yaj4/srqWe6dFT
     JChGxIJ7SUR6ytEJiadKwhkw35/FOimVj1lNSLKa/cP8ljpI7dn9l6WDDx2vdL/kqj
     1XSvi31gk2Cmi9nYCx+EYbxSHembKIQ/K0pRjfes=
To: 

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