[RSS Feed/News] Expected response code 250 but got code "501", with message "501 5.1.7 Bad sender address syntax

[XenForo]

Looks like a misconfigured spambot.

Code:

Swift_TransportException: Email to %spinfile-names.dat%%spinfile-lnames.dat%%random-1-100%@sugar.westrb.com failed: Expected response code 250 but got code "501", with message "501 5.1.7 Bad sender address syntax " src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:459

#0 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(344)...

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