Quirin Hofstaetter <[EMAIL PROTECTED]> writes:

> We get more and more spam mails that use an empty evelope sender <>
> or just an @ followed by a domain name (e.g. "xyz <@yahoo.com>") In
> both cases TMDA lets the message get through.

No, you let them through by configuring your TMDA to allow such
messages.  TMDA does not let them through by default.

Your LOGFILE_INCOMING file will show you exactly which rule allowed the
message through.

> Does anybody know how to stop at least the messages with an envelope
> sender starting with @?

Postfix has a configuration option called 'strict_rfc821_envelopes'
that you can enable, which will block mailformed messages like this.

You should apply the equivalent fix to whatever MTA you are running.

> Another question: has anybody an idea how to set a filter matching
> on addresses like "[EMAIL PROTECTED]"?

See the documentation, but something like 'from [EMAIL PROTECTED] bounce'
would be an example.
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