Email delivery problem with SMTP in a single account


Oct 11, 2018
Buenos Aires, Argentina
cPanel Access Level
Root Administrator
Hello everybody.

I'm facing a strange issue here. I have a VPS with multiple cpanel accounts (customers) which can receive/send emails without problems and without getting into the junk/spam folder.

On the other hand, there is just one account of those whose emails keep getting marked as spam on Gmail and also Outlook (haven't tested Yahoo).

I'm currently performing these tests using RoundCube/SquirrelMail and also with a custom PHP script (PHPMailer) using SMTP authetication. It works like a charm for every customer except this one.

My mail score according to is 10/10. Also there are no problems found in MXToolbox, DKIM, SPF, DMARC, rDNS, everything seems to be OK.
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Any help or idea would be really appreciate :)

Thank you.
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