References
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550 5.7.26 This mail is unauthenticated, which poses a security risk to the sender and Gmail users, and has been blocked. [...]
Fehler beim Mailversand
Fehlercodes
Vollständiger Fehler 550-5.7.26 This mail is unauthenticated, which poses a security risk to t...
550 5.7.23 Please see http://www.openspf.org/Why?id=[...]
Fehler beim Mailversand
Fehlercodes
Vollständiger Fehler: 550 5.7.23 Please see http://www.openspf.org/Why?id=<Zeichenfolge>550 (<...