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Fighting Mailserver Problems – Delivery Failed

First of all, check if the IP of the sending server is on any of the major blocklists:

Make sure you have the SPIF Settings for the sending domains set to the minimum security standard. For instance. Outlook.de requires at least something like this:

example.com IN TXT "v=spf1 a mx ip4:85.214.230.249 -all"

More Information:

Auch interessant: Zustellungprobleme bei Weiterleitungsadressen: Werden Sie nicht zur Spam-Schleuder:

 

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