Thank you for your support. I have changed the regexp to

^X-Mailer: (?!Microsoft Outlook .*).*$

and I will watch for the next emails. I will also watch for the logs for a few days, then revert back to original file.

Thanks

On 02/12/2013 08:37 AM, Mark Sapiro wrote:
METU E-List Admin wrote:
--------------------------------------------
$ bin/config_list -o - REGISTER | grep -A20 header_filter_rules
header_filter_rules = [('^X-Mailer: (?!Microsoft Outlook .*)$', 7,

This regexp won't work. The negative lookahead does not advance the
current position so your regexp says look for 'X-Mailer: ' at the
beginning of the line not followed by 'Microsoft Outlook .*' but
followed immediately by the end of the line, so it will only match a
header like 'X-Mailer: ' not followed by anything.

What you want is

^X-Mailer: (?!Microsoft Outlook .*).*$

or just

^X-Mailer: (?!Microsoft Outlook .*)

or maybe even just

^X-Mailer: (?!Microsoft Outlook )


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