Unable to send mails from server getting error Our system has detected that this message is 550-5.7.1 likely unsolicited mail


Unable to send mails from server getting error Our system has detected that this message is 550-5.7.1 likely unsolicited mail



Getting "Our system has detected that this message is 550-5.7.1 likely unsolicited mail.To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked.",connection timed out, delivery temporary suspended error message while sending to gmail users. mails are being delayed on other email users as well.



can any one please guide me on this.



/var/log/maillog image which shows error:



enter image description here





Are these account level emails or newsletter type things?
– castis
Jun 29 at 12:57





Do you have an SPF Record set up? What about DKIM? Are you using authenticated SMTP? Are you sending spam?
– Mr Glass
Jun 29 at 12:57





SPF and DKIM records are set, Using zoho SMTP. and its not a spam its a automated reply to user who register on site
– Mohit Seth
Jun 29 at 13:01





mails are particularly blocked to gmail users, for other users its getting delayed but atleast it being delivered to them
– Mohit Seth
Jun 29 at 13:03





They're telling you "we think this is spam". That's frequently based on things like the content of the email, users marking it as spam, the reputation of your server, etc. See if you're on a blacklist (mxtoolbox.com/blacklists.aspx), try using an email service provider like Amazon SES or Sendgrid, etc.
– ceejayoz
Jun 29 at 17:06









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