MilkyMeda
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I haven't come across any source explaining this error. These are just ordinary notification emails. Does anyone have an idea?
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- Swift_TransportException: Email to [email protected] failed: Expected response code 250 but got code "503", with message "503 sender already given "
- src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:457
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