* Stefan Caunter <s...@caunter.ca>:

> It could be viewed that half a million delivered in 24 hours is fine.
> Are you signing the mail? This can help with delivery rates to the
> large webmailer mx destinations.

There are many things to consider:

* DKIM signing - which is the prerequisite for getting into feedback
  loops at major email providers
* get into the feedback loops at major email providers
* SPF
* good reputation (e.g. SenderBase, senderscore)

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | http://www.charite.de
            

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