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Emails sent by Marketo are being blocked

Question asked by ASW Admin on Aug 21, 2015
Latest reply on Nov 7, 2016 by Iryna Zhuravel

Emails to some clients are bouncing. The message we receive is: "554 Service unavailable; Client host [potomac1050.mktomail.com] blocked by bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?199.15.213.50" to "554 Service unavailable; Client host [potomac1053.mktomail.com] blocked by bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?199.15.213.53"

 

Note that this only applies to some clients and not to everyone. Is there something that we can do in order to prevent the receipient from blocking our email?

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