This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: Devilliers@botanicalsociety.org.za host botanicalsociety-org-za.mail.protection.outlook.com [104.47.19.238] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [CT2ZAF01FT902.eop-zaf01.prod.protection.outlook.com] devilliers@ru.ac.za host mx.ru.ac.za [146.231.128.53] SMTP error from remote mail server after RCPT TO:: 550 Invalid Rhodes University e-mail address: devilliers@ru.ac.za devill@ais.up.ac.za host aspmx.l.google.com [172.217.194.27] SMTP error from remote mail server after RCPT TO:: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser t35si17107674pgl.847 - gsmtp