Sets the default font for outgoing e-mails and fixes attachment issues.
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Free
UniversalMailer is a Mail.app plugin that aims at setting the default font for outgoing e-mails and fixing issues with attachments.
Enable the plugin, set a default font for outgoing e-mails and you're done: the next e-mail you'll send will have a nice default font and won't show those annoying ATT00001.htm attachments any more. The HTML signature is not strictly needed, since the plugin can automatically choose to send riched text e-mail for you.
DOWNLOAD
Free