I am facing the same issue. My email settings are fine. The Telnet works well. It says Mail service ready.
There are no errors on the python logs too. But, we are not receiving emails.
2018-05-09 13:16:31,005 -0000 INFO sendemail:1134 - sendemail pdfgen_available = 1
2018-05-09 13:16:31,036 -0000 INFO sendemail:1268 - sendemail:mail effectiveTime=None
2018-05-09 13:16:40,089 -0000 INFO sendemail:1288 - Generated PDF for email
2018-05-09 13:16:44,147 -0000 INFO sendemail:134 - Sending email. subject="ErrorSummary", results_link="None", recipients="[u'XXXX@accenture.com']", server="xxxxx.smtp.accenture.com:25"
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