SMTP Error: data not accepted.

Hi @rocketeer76,

Thanks for reaching out. The error usually appears if the email is sent with an incorrect format/header etc. Most likely is the ‘From Email’ of the email that is generating this error doesn’t match the SMTP username. If you don’t force From Email from WP Mail SMTP, the ‘From Email’ is usually set by the plugins sending the emails. You’ll need to identify this email and plugin sending the email and see the technical details. Email logging plugins might help if you encounter the issue again or your SMTP provider might have logs of all the emails.

I hope this helps!

Hi @jokki,

If you still get this exact error:

SMTP Error: data not accepted.

after checking the “Force From Email” option. Then, there’s some invalid/incorrect email data for example header in the sent email that your SMTP server does not accept. Some SMTP providers such as Yahoo also do not custom “Reply-to” header. You might want to identify the exact email that is creating such an error and troubleshoot the header of that email. Email logging plugins might be helpful in this case.

I hope this helps!

Hi @jokki,

Could you please make sure the “From Email” in WP Mail SMTP matches your SMTP username and you have “Force From Email” checked? If you’re still getting that exact error message described in the original questions, please let me know the SMTP settings you’re using or share the screenshot from the WP Mail SMTP settings area and the list of the activated plugins in your site?

Thanks!

Hi @maxchrusciel,

Could you please share the notification settings in your forms and the WP Mail SMTP settings? Are you using your own email in WPForms “From Email” or “Send To Email Address” field? Either way, that should not be an issue if you have forced from email from WP Mail SMTP.

Thanks!

Hi @maxchrusciel,

Thanks for the details!

the moment I change that error and no send.

Could you please share what email address you change to and send a test email from WP Mail SMTP to the same email addresses?

Generally, an empty email subject should not be an issue, but there’s something your SMTP provider isn’t accepting. Possibly your SMTP account isn’t able to send emails to an external email address because it’s still not activated?

Thanks!