Message could not be sent.Mailer Error: SMTP Error: data not accepted.

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No problems for 9 years and this just started yesterday. Any suggestions?

SLB108
asked 5 months ago171 views
2 Answers
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Hello.

What actions were you taking before that error occurred?
Also, what kind of service caused the error?
Are you using Amazon SES to send emails?

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EXPERT
answered 5 months ago
  • Thanks for the super fast reply!! No actions. Everything has been the same. PHPMailer is what I'm using. Yes, Amazon SES. I had been receiving emails about changing to TLS 1.2, "Please update your client software as soon as possible to use TLS 1.2 or higher to avoid an availability impact." However, phpinfo.php shows that I have tlsv1.2.

  • Just to be sure, you might want to check whether TLS 1.1 is being used. The answers to the questions below contain research methods that may be helpful. Please also check if the SMTP user name etc. match. https://repost.aws/questions/QUlQYKoGVNQkuKY_bdyU5DNg/ses-update-tls-connections-to-1-2-to-maintain-aws-connectivity

  • How do I check whether TLS 1.1 is being used in PHPMailer?

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I found the answer! https://stackoverflow.com/questions/69873422/how-to-force-tls-1-2-usage-for-phpmailer-5-2

Had to change: STREAM_CRYPTO_METHOD_TLS_CLIENT To: STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT

All is well now. :)

SLB108
answered 5 months ago

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