Error sending email – SMTP error since the last update

  • Daniel

    (@danielechotests)


    2 days, 21 hours ago

    Hi,
    I updated to the latest version (5.29) on June 12.

    Since then, I have been receiving this notification daily for various email addresses, and no emails are being sent anymore:

    Sending has been paused due to a technical problem with SMTP: SMTP Error: data not accepted. Unprocessed subscriber: (k***@************.de)
    Please check your sending method settings.
    I have to click “Resume sending” to get it going again. Then the next day, it’s the same thing all over again.

    Does anyone else have the same problem or any tips? It ran without issues for years before the update—no errors of this kind. SMTP settings haven’t been changed either. Test emails work fine, too.

    • This topic was modified 2 days, 21 hours ago by Daniel.
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  • Plugin Support Gui A. a11n

    (@guicmazeredo)

    18 hours, 49 minutes ago

    Hi there, @danielechotests.

    Thanks for reaching out!

    This error shouldn’t be related to the update. That was likely a coincidence.

    If sending is paused when MailPoet encounters an invalid email address (i.e.: an unprocessed subscriber), it means that, for some reason, SMTP is rejecting these invalid email addresses and returning an error classified as a hard error.

    As there is no bounce handling out the box unless you are using our MailPoet Sending Service, you have to delete the subscriber and then resume sending.

    You can find out more about bounce management here.

    Alternatively, you can contact your host and ask why they are rejecting these specific email addresses or change your sending method.

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