Many thanks for the useful replies. Hopefully the matter is now fixed!
Cheers
Derek


On 22 Nov 2012, at 17:27, burty <[email protected]> wrote:

> 
> 
> Hi Derek, 
> 
> These certificates are stored in Keychain Access. When I clicked on your 
> "show Details" it put yours in my Keychain. 
> Why not simply go to yours: Application/Utilities/Keychain Access.
> Click on 'Certificates' within the Category section, bottom left. 
> You will see your self signed certificate on the right in the list, just 
> highlight it and delete it. 
> 
> Graham
> 
> 
> 
> On Thursday, November 22, 2012 4:16:07 PM UTC, Derek Cross wrote:
>> Hi Sam
>> it has "None" against the TLS Certificate - see arched screenshot.
>> Thanks
>> Derek
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> On 22 Nov 2012, at 12:13, Sam - MacAmbulance <[email protected]> 
>> wrote:
>> 
>> Hi Derek
>> 
>> 
>> if you go to mail menu > preferences > accounts > do any of your accounts 
>> have a TLS Certificate set? (last option in the accounts window).
>> 
>> 
>> Regards
>> 
>> 
>> Sam
>> 
>> 
>> 
>> 
>>      MacAmbulance
>> Providing affordable Apple & PC services
>> Sam Mullen
>> 
>>      07747 778022
>> 
>>      http://www.macambulance.co.uk
>> 
>>      [email protected]
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> On 22 Nov 2012, at 12:09, Derek Cross <[email protected]> wrote:
>> Hi Smuggers
>> 
>> Here's a thing. The emails I send seem to have a warning message at the top 
>> stating " Unable to verify signature" - I didn't ask for this facility and 
>> my email recipients are finding it disconcerting!
>> 
>> How do I change this?
>> 
>> OS 10.8.2  Mail 6.2
>> 
>> Many thanks.
>> Derek
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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