Sendmail invalid sender signature

Hi, for the last week i have been seing tons of this signature alert firing, now the explanation of this signature in NSDB is :"Triggers on any mail message with a pipe (|) symbol in the From: field".
i don't have sendmail , all these signatures are firing when trying to go through my mail filters. i have tuned it from before to drop the packet and produce an alert , but why tons of signatures this week and from different source addresses ? is this legitimate traffic i'm blocking ?
thank you

They could very well be trying to exploit this extremely old vulnerability. Look at a packet capture. Do the mail transactions triggering these alarms look legitimate? Research the sources of these alarms. Is there a single source or multiple? Are the sources trusted or well known entities? If not, do they show up in any black lists? Answering these questions might help you decide what to do from a response/tuning perspective.
Unless you don't have something better to do (i.e. more important alarms to investigate) I don't know that I'd spend a whole lot of time on these. Follow attmidsteam's advice and disable the sig and move on.

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{ terminal = "urxvt"
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Scionar wrote:So any idea how to fix this problem with invalid type signature?
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Edit: And ninja'd again.
Last edited by Runiq (2010-12-03 23:31:43)

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could you solve the problem? while I'm connecting to sql server , I get the same error. in fact, i can connect to server through eclipse ide but when i export my application into a jar and try connecting to server through the jar, this problem occurs.
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Exception in thread "main" java.lang.SecurityException: invalid SHA1 signature f
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You may have found a bug in the AIR installer or packager. Given that the signature is an XML file, the "&" character seems the most likely culprit.
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Perfect, thanks.
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Afternoon,
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See how the above method is self explaining. Yes, returning an array is more self explanatory. Are you defensively copying the array?
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BigChap posted this reply ealier - it worked great for me.
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Perfect, thanks.
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ever since i have been asked to upgrade to 7.2, i have not been able to ugrade to 7.2 due to a invalid digital signature.
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Sendmail invalid sender signature

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