I would like to send a simple, email address change confirmation email with php and exim4. I tested my mail with lot of free email provider and everywhere arrived my email well except outlook.com. In the outlook.com, my mail, arrived into the junk directory, but I don't understand why. I have good dns, ptr, spf, dkim records and everything is "pass".
In the message I have 5 simple sentences and one link like this:
https://www.example.com/email-activation/1270a967d
This is some interesting line from my header:
Authentication-Results: spf=pass, dkim=pass
X-Mailer: PHPMailer 5.2.21
CMM-X-SID-PRA: noreply@example.com
CMM-X-AUTH-Result: PASS
CMM-X-SID-Result: PASS
CMM-X-Message-Status: n:n
X-MS-Exchange-Organization-SCL: 5
X-MS-Exchange-Organization-PCL: 2
X-Forefront-Antispam-Report: EFV:NLI;SFV:SPM;SFS:(28900001);DIR:INB;SFP:;SCL:5;SRVR:HE1EUR02HT176;H:SNT004-MC7F9.hotmail.com;FPR:;SPF:None;CAT:SPM;LANG:en;
X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:(444111334)(444112120)(82015046);SRVR:HE1EUR02HT176;BCL:0;PCL:0;RULEID:;SRVR:HE1EUR02HT176;
SpamDiagnosticOutput: 1:22
SpamDiagnosticMetadata: Default
X-MS-Exchange-CrossTenant-FromEntityHeader: Internet
X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1EURHT176
X-MS-Exchange-Organization-AuthSource: HE1EUR02FT050.eop-EUR02.prod.protection.outlook.com
X-MS-Exchange-Organization-AuthAs: Anonymous
X-OriginatorOrg: outlook.com
X-Microsoft-Antispam-Mailbox-Delivery:abwl:0;wl:0;pcwl:0;kl:0;iwl:0;ijl:0;dwl:0;dkl:0;rwl:0;ex:0;auth:1;dest:J;WIMS-SenderIP:1.2.3.4;WIMS-SPF:example%2ecom;WIMS-DKIM:example%2ecom;WIMS-822:noreply%40example%2ecom;WIMS-PRA:noreply%40example%2ecom;WIMS-AUTH:PASS;ENG:(102400140)(102420017);RF:JunkEmail;OFR:SpamFilterAuthJ;MIME-Version: 1.0
I think the problem is the SCL value "X-MS-Exchange-Organization-SCL: 5", but I don't understand what is the problem with the simple mail with one link. Can somebody say to me, how can I resolve this and how can I find the reason?
BTW I tested my email with https://www.mail-tester.com/ and my score is 10/10.