Preventing multiple signatures in email conversation?

Julian Field MailScanner at
Mon Apr 27 18:25:46 IST 2009

On 27/04/2009 18:20, Kevin Miller wrote:
> Julian Field wrote:
>> On 27/04/2009 17:42, Chris Barber wrote:
>>> Is there a way to get MailScanner to not put multiple signatures?
>>> Like detect that there is already one on the message and not append
>>> subsequent signatures? I would rather not rely on the email clients
>>> to do this...
>> I think this has already been mentioned in this thread. But...
>> With an HTML signature, it's easy as you can insert some hidden text
>> in the sig that doesn't appear in the viewed result, and use that as
>> an identifier to say "Here is the sig, don't add another one".
>> But in a plain text message, it's a lot harder as there is no way of
>> putting in hidden text, and once the message has been badly quoted by
>> some mail client when the reply was done, you can't reliably
>> automatically find the original signature in it.
>> When you're passing through multiple MailScanner servers in the same
>> organisation, you can do it with a header. But you can't trust the
>> contents of any header once you've been outside your organisation, as
>> many environments throw away most headers, particularly when the
>> message has been replied to.
>> In the cases of multiple MailScanner servers, and HTML signatures, I
>> can and already have solved the problem. There just isn't a neat way
>> of doing it for plain text signatures, sorry.
>> If you have any stunning ideas, then let me know :-)
> Way back in the old DOS days, I used to use ASCI character 255 as an invisible character now and then.  Can't remember what for, but for some reason I needed a non-space white character.  It was easy to generate - hold down the Alt key and press 255 on the keypad.  It was invisible, but benign.  Perhaps sticking char(255) in the text sig would be a possiblity?
ASCII 160 is always quite good for that, it's a non-breaking space.


Julian Field MEng CITP CEng
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