phplist is a popular software for sending newsletter to large lists of recievers. It has a large number of features which I will not go into depth here. For more information about what phplist can do – visit the phplist homepage.
If you are experiencing problems when you are sending a newsletter containing local characters, like the Swedish Å, Ä and Ö in the subject line, the most probable reason is that administration web pages are rendered in a character set different from the one used in the newsletter.
The following solution is assuming that you are running phplist on a Linux host.