Short: Missing \r before each \n prevents sending of mail with tikiwiki installation on windows server.
Workaround
I added a 0x0d before each 0x0a in the user_validation_mail.tpl.
Importance
9 high
Priority
45
Ticket ID
2315
Created
Monday 16 February, 2009 18:46:09 GMT-0000 by Unknown
LastModif
Wednesday 05 May, 2010 20:45:21 GMT-0000
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Keywords
The following is a list of keywords that should serve as hubs for navigation within the Tiki development and should correspond to documentation keywords.
Each feature in Tiki has a wiki page which regroups all the bugs, requests for enhancements, etc. It is somewhat a form of wiki-based project management. You can also express your interest in a feature by adding it to your profile. You can also try out the Dynamic filter.