[Tickets #7052] procmail vacation not working on Centos 3

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Ticket URL: http://bugs.horde.org/ticket/7052
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  Ticket             | 7052
  Created By         | Eric Rostetter <eric.rostetter at physics.utexas.edu>
  Summary            | procmail vacation not working on Centos 3
  Queue              | Ingo
  Version            | 1.2
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Eric Rostetter <eric.rostetter at physics.utexas.edu> (2008-07-09 16:40) wrote:

Centos (RHEL) 3.x, sendmail 8.12.11-4.RHEL3.6, procmail  
3.22-10.el3.centos.0 (e.g., a stock Centos 3.9
Final machine).

User has setup a vacation message via ingo using the procmail driver,  
and using a time period.  (I have not
tested without the time period; should try that sometime).

Using the stock vacation procmail recipe, it sends no vacation  
messages.  The message is delieved
normally to the recipient.  The procmail log shows:

procmail: Executing "formail,-rD,8192,/u1/demkov/.vacation.demkov"
procmail: Non-zero exitcode (1) from "formail"
procmail: Rescue of unfiltered data succeeded
procmail: Non-zero exitcode (-11) from "procmail"

If I change the recipe from using "0: Whaf" to use "0: Wha" then the  
vacation message is sent properly, but
the recipient gets two copies of the message in their inbox.  This is  
preferable to not sending a vacation
message, but still not good...

I tried using Whafi, but it didn't seem to help (still got the errors  
shown above).

Any ideas what is wrong?