[Kolab-devel] Undelivered Mail Returned to Sender

[email protected] (Mail Delivery System) Tue, 29 May 2018 14:17:45 +0000 (UTC)
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<[email protected]>: host faui45.informatik.uni-erlangen.de[131.188.34.45]
    said: 504 5.5.2 <localhost>: Helo command rejected: need fully-qualified
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