The monit project is really useful in many ways. But what I am missing now is a simple method how to test conditions on some output produced by a script or a command. For example, I would like to trigger an alarm when the mail queue size exceeds a defined limit. I'm not sure where but somewhere I found that the feature should be implemented in the future release of monit. I'm hoping.
RFC2821 and RFC2822 state clearly that only 7bit ASCII characters are allowed in Internet mail addresses. The following list shows all the ASCII characters and explains whether they can or should be allowed in the local part of a mail address.
Mailserver Spamfilter und Malwarescanner Testmails verschicken
Online Testseite um zu checken ob ein Mailserver als Relay agiert
K9 is an opensource email client based on the Email application shipped with the initial release of Android. K9 is focused on making it easy to chew through large volumes of email. It's our hope that K9 leads to improvements in the core Android mail client.
SMTP Testutility - Webinterface
The Anti-Spam SMTP Proxy (ASSP) server project is an Open Source, Perl based, platform-independent transparent SMTP proxy server that leverages numerous methodologies and technologies to both rigidly and adaptively identify e-mail spam. ASSP is easy to set up because it requires only minor changes to the configuration of your your Mail Transfer Agent.