I just don't know what to do (apart from removing the programm and installing ist again): I can't send e-Mails via MAIL - it worked fine a few days ago (different location). Receiving is no problem. Strange: on my second Macbook (old version) there are no problems at all. I'm just switching my Computer (good old Macbook to good new Macbook) - apart from approx. 3 years and the general improvements (processor etc) the computers are the same. Both are MacOSX 10.5.7 and the MAIL-version is Mail 3.6. The MAIL-configuration is identical (I checked triple and more). Internet connection is via airport, IP-address differs (of course), works on both computers. Anyone any idea what might cause this problem? I'm not really an expert - so it might be something really stupid... THANKS!