Thank you for your answer. But I don't know what you mean. I know 2 points to set the default font for outgoing html mails. First point is in the settings menu - composing messages - Default font of HTML message = Verdana. The other point is in the main.inc.php
// Default font for composed HTML message.
// Supported values: Andale Mono, Arial, Arial Black, Book Antiqua, Courier New,
// Georgia, Helvetica, Impact, Tahoma, Terminal, Times New Roman, Trebuchet MS, Verdana
$rcmail_config['default_font'] = 'Verdana';
But nothing works for me in a new mail. Every new mail has no font type. OK it's possible to set this manual in the drop down menu and it works. But manual ....:-( why not automatically? Please be patient with me I'm not a php coder, only a user with a low level knowledge about php scripting.