Checked VPS server log.
When sending VPS generated email to gmail, the following log details show. Please note, email is received by other email, e.g. Yahoo
ECDHE-RSA-AES128-GCM-SHA256:128: SMTP error from remote mail server after end of data: 550-5.7.1 [[url removed, login to view] 12] Our system has detected that this message is\n550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail,
I searched google, and I found this
Then i checked on google 550, "5.7.1", Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, review this article.
I clicked on this article link, [url removed, login to view]
I also checked mxtoolbox on my domain, it shows the following problems
Reverse DNS Resolution FAILED! This is a problem
Reverse DNS does not match SMTP Banner
Reverse DNS Resolution - No PTR Record found
I suspect this is the reason.
I confirm that i have correctly add TXT record for SPF record and google site verification in DNS management.
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