So is it some french accents in the subject line which possibly muddle the whole thing ?
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Yes.

Moreover, I've prepared headers by myself and send message with them )(using simple script with mail() function and 'Content-type: text/html; charset=windows-1251' . '\r\n'; setting). Everything is fine: no space stripping, correct char encoding etc.

ADDT send messages using content_type = 'multipart/alternative', and all other messages that I have in my inbox are using 'text/html'. Maybe this is the issue?..

The native server behaviors for PHP don't change since I don't know... ultradev version? :s

In CS 4 beta, no new server behaviors at all.

So...

Well, I hope they realize that we need some server behaviors, and as far as I can see, only ADDT could provide that. But if the Kollection guys have moved out to spry... I'm really concern about the future of php development over dreamweaver.

That will be the greatest mistake of Adobe if they wont include ADDT in CS4. I've used so many editors before DW MX. But after I've discovered (ex) Interakt products (Kollection a.k.a. ADDT) I stick to Dreamweaver ONLY and booking each new version since that. If they don't need us to buy fresh copy - it theirs decision. Not very smart from my point of view...

Still hope there will be ADDT for CS4!