Support » Plugin: WP Mail SMTP by WPForms » Emails are not sent

  • Resolved sasabanjavcic


    Hi there,

    until a few days ago everything was working properly, then I have noticed that emails are not sent and I get this error in Plugin WP Mail SMTP by WPForms:

    WordPress: 5.7.2
    WordPress MS: No
    PHP: 7.4.22
    WP Mail SMTP: 3.0.3
    Mailer: sendinblue
    Constants: No
    API Key: Yes
    Email Source: WP Mail SMTP
    Mailer: Sendinblue
    [503] Server error: <code>POST</code> resulted in a <code>503 Service Unavailable</code> response:
    upstream connect error or disconnect/reset before headers. reset reason: connection failure

    Can someone help?

    • This topic was modified 5 months, 2 weeks ago by sasabanjavcic.
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