i have a problem with some strange spam emails, which lock up my email reception. The problem is the following : I am using fetchmail to download my email (from a pop3 server), and fetchmail passes the email to my local sendmail daemon who gives it to my local imap server (cyrus). This works fine. But sometimes i got a spam email, which has an unresolveable dns origin, and this makes my sendmail crazy in a way, that sendmail wants to resolve but gets a timeout (around 20s). In the meantime the fetchmail which is actualy waiting for sendmail to accept the message gets a timeout from the pop server where it is connected to. Because of that timeout fetchmail stops receiving email from pop server and tries again next time, but next time it will start with the same spam email again, and it all starts again, actually no more new mails will arrive until i delete this particular email from the pop server manually.

Is there a way to tweak the timeout behavior of sendmail, or maybe even no dns resolve option for sendmail, or even better some way to tell fetchmail to use the idle command to keep the connectio to the pop server open ?

Karsten Fuhrmann

Cartoon-Film Thilo Rothkirch
System Administration
phone:  +49 30 698084-109
fax: +49 30 698084-29

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