ok Rickard, I have tried with my internet provider's smtp data (login, password and name) but with unsuccess :
error message (quote) :
An error was encountered
Error: Unable to send e-mail. Please contact the forum administrator with the following error message: "502 Error: command not implemented ".
Note (1), I may be wrong in the sense that I'm not fluent in smtp : )
Note (2), my free host is not 'for everybody' and they work fine (imho of french novice ; see links for more information about php version they work with). You know, of course, free stuff is often as good if not sometimes better as expensive if you choose the good one (it's the more difficult) and punBB, and there are many other brilliant programs that are free, is a good example : free and great.
You told me : your host may be the source of the problem but remember I can send mail (with php mail fonction) from profile then it's strange I can't send email vby subscription or for registration, no ?
For better testing with smtp (I probably have not filled in the parameters fields as expected) : do you have link or information for me ? is there 'public' smtp, is there some basic information I can use just for testing ?
Thanks,
abclf.
[edit]
ps : please, can you tell me, Rickard, in what way the punbb mail process works differently in the case of (first) sending mail from profile page and (second) registration, or subscription.