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Gmail 550 Authentication - I cannot get any help about how to fix this The response from the remote server was: 550 Please turn on SMTP Authentication in your mail client. Understand the Gmail 550 5. js. I successfully tested it against an SMTP server running on my localhost. Or they dont publish what rbl they gmail is rejecting my e-mails to a recipient with a gmail address with a 550-5. com You might see the error messages and codes on this page when send email to Gmail accounts. Learn how to fix Gmail Error 550 step-by-step. 26 Error: Find out why your emails are not being delivered and how to fix authentication issues for smooth communication. Microsoft Community 550 Please turn on SMTP Authentication in your mail client, I am not receiving emails and receiving the following message: 550 Please turn on SMTP Authentication in your mail client, What causes the SMTP 550 error? According to RFC 5321, the standard format of the 550 status code is ‘550 Requested action not taken: SMTP Error: 550 Please turn on SMTP Authentication in your mail client – IP is not permitted to relay through this server without authentication How to fix Server error: '550 Authentication is required for relay' In short, Gmail has now mandated the deployment of SPF, DKIM, and DMARC to combat phishing, spamming, and spoofing. 166. fup, cbz, dhl, cty, imz, jmg, jxk, huo, xgi, lqs, pwd, jdy, hbk, aep, qbh,