In need of help using the email template module

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Hello, I am in need of help using the email module app because everytime I try to test, by sending an email the same error shows up, so I am confused as to why this happens, and want to know whether it is a problem on what I have coded or a problem with the server. Any help to shed some light on this would  be very much appreciated thank you. ​ Here is  screenshot of the error I keep on getting I can provide more information if needed. Thank you very much in advance 
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1 answers
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Isn't this exactly the same issue as in https://forum.mendix.com/link/questions/92447 ?

With regards to the issue, there is already a possible answer in that thread.

Another possible solution is trying to send an e-mail with localhost as server. you can then locally run a tool like this in order to intercept the e-mails: http://nilhcem.com/FakeSMTP/

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