XF 2.2 Expected response code 250 but got code "501", with message "501 5.1.7 Bad sender address syntax

[bottiger]

Looks like a misconfigured spambot.

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): Swift_Transport_AbstractSmtpTransport->assertResponseCode('501 5.1.7 Bad s...', Array)
#1 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(305): Swift_Transport_AbstractSmtpTransport->executeCommand('MAIL FROM:<boun...', Array, Array, false, NULL)
#2 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(392): Swift_Transport_EsmtpTransport->executeCommand('DATA
', Array, Array)
#3 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(499): Swift_Transport_AbstractSmtpTransport->doDataCommand(Array)
#4 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(518): Swift_Transport_AbstractSmtpTransport->doMailTransaction(Object(Swift_Message), 'bounce+917fbaed...', Array, Array)
#5 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(206): Swift_Transport_AbstractSmtpTransport->sendTo(Object(Swift_Message), 'bounce+917fbaed...', Array, Array)
#6 src/XF/Mail/Mailer.php(304): Swift_Transport_AbstractSmtpTransport->send(Object(Swift_Message), Array)
#7 src/XF/Mail/Queue.php(138): XF\Mail\Mailer->send(Object(Swift_Message), Object(XF\Mail\SmtpTransport), Array)
#8 src/XF/Job/MailQueue.php(12): XF\Mail\Queue->run(8)
#9 src/XF/Job/Manager.php(258): XF\Job\MailQueue->run(8)
#10 src/XF/Job/Manager.php(200): XF\Job\Manager->runJobInternal(Array, 8)
#11 src/XF/Job/Manager.php(84): XF\Job\Manager->runJobEntry(Array, 8)
#12 job.php(43): XF\Job\Manager->runQueue(false, 8)
#13 {main}

 

[PaulB]

That's a spam bot trying to register on your website, but entering invalid data.

 

[bottiger]

I am aware of that, but can this be fixed so it doesn't fill my error log?

 

[PaulB]

I think that's technically a valid email address, at least according to the standard. It almost looks like the issue is that it's resulting in an invalid envelope sender being generated. Are you able to see the full envelope sender anywhere? It should begin with "bounce"; you can see the start of it on this line:

Swift_Transport_AbstractSmtpTransport->executeCommand('MAIL FROM:<boun...', Array, Array, false, NULL)