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A message that you sent could not be delivered to one or more of its
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  alexandermaune6@gmail.co
    retry timeout exceeded
  alexandra.zaby@uni-tuebingen.de
    host b1541.mx.srv.dfn.de [194.95.234.90]
    SMTP error from remote mail server after RCPT TO:<alexandra.zaby@uni-tuebingen.de>:
    550 5.1.1 <alexandra.zaby@uni-tuebingen.de>: Recipient address rejected:
    undeliverable address: host mx05.uni-tuebingen.de[134.2.5.215] said:
    550 5.1.1 <alexandra.zaby@uni-tuebingen.de>: Recipient address rejected:
    undeliverable address: Address lookup failure (in reply to RCPT TO command)
  alexanderborder@saps.org.za
    host securemail-mx1.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<alexanderborder@saps.org.za>:
    550-rejected because 13.251.245.207 is in a black list at
    550-b.barracudacentral.org
    550 http://www.barracudanetworks.com/reputation/?pr=1&ip=13.251.245.207
  Alexandr.KATRAGA@agrana.com
    host agrana-com.mail.protection.outlook.com [104.47.6.36]
    SMTP error from remote mail server after RCPT TO:<Alexandr.KATRAGA@agrana.com>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281)