Problem with mailer plugin My problem is that the Mailer plugin (version 0.5) does not work with Craft Pro 2.3.2620. Unfortunately, I get no error message - it still does not send e-mail (the log is empty). Craft in general is able to send e-mails.

Has someone else the same problem?
While this question is a bit old, for the sake of completeness I'll echo what Brad mentioned in the comment above.

Plugin bugs are best handled by notifying the developer directly. This plugin happens to be on Github and it appears that the developer has responded to all open issues and closed them out.

Additionally, the convention for tagging Stack Exchange posts that are related to plugins is to prefix the plugin's name with the word plugin. In this case, a good tag may be plugin-craftmailer or plugin-mailer.