<x-tad-smaller>On the geeklog 1.3.9, if the email username filed contain a dot ".", the email from field will be only an @ and the sendmail or smtl system will refuse to send the mail.
For example, my site name is Nabuk.org and all the registration mail or password lost mail are dropped by sendmail or by my smtp server because the email has @ as from field
Also if a user with a login wich has a dot (john.doe) try to send a mail, sendmail or the smtp server drop this mail because it have @ as from field
enabling the old mail method in lib-custom.php will solve the problem.
I can't try to use the standard mail method becouse my provider has safe_mode=on</x-tad-smaller>