Yeah - I think rather than fiddle around, it's time for meto consult my local 
Mac guru. I'll report back!
Derek


On 21 Jan 2013, at 11:06, [email protected] wrote:

> Derek,
> I am still getting the yellow banner etc.
> For under Mail>Prefs>Advanced for my Apple email authentication it says Apple 
> Token and for a gmail account it says password and for a POP account it also 
> says password. Guess you also should have those selected depending on what 
> sort of email it is. 
> The experts must be stuck in the snow!
> Nick
> On 21 Jan 2013, at 11:00, Derek Cross <[email protected]> wrote:
> 
>> Hi Graham
>> Had already done that but without success – presumably you're still getting 
>> a warning with this reply.
>> Cheers
>> Derek
>> 
>> 
>> 
>> On 21 Jan 2013, at 10:53, "Graham Burt :-)" <[email protected]> wrote:
>> 
>>> Hi Derek, 
>>> 
>>> If you go into Mail - Preferences - Accounts.
>>> Then highlight the e-mail account on the left.
>>> Under the 'Account Information' tab
>>> At the bottom, on the right, what is next to TLS Certificate in the drop 
>>> down menu?
>>> I would change it to "None"
>>> 
>>> Try that?
>>> 
>>> Graham
>>> 
>>> 
>>> - - - 
>>> 
>>> Graham Burt
>>> Managing Director
>>> smileitworks
>>> 
>>> 2-4 Dubarry House, Hove Park Villas
>>> Hove, East Sussex   BN3 6AE
>>> 
>>> 07968 619369  -  01273 731110
>>> www.smileitworks.com - ipod to be won!
>>> 
>>> On 21 Jan 2013, at 10:51, Derek Cross <[email protected]> wrote:
>>> 
>>>> Hi Ben
>>>> Yes I understand, but I don't want to fiddle until I have some expert 
>>>> advice!
>>>> You'll understand that many people find this message off-putting when they 
>>>> receive this kind of mail message!
>>>> 
>>>> Cheers
>>>> Derek
>>>> 
>>>> 
>>>> On 21 Jan 2013, at 10:47, Ben Rubinstein <[email protected]> wrote:
>>>> 
>>>>> On 21/01/2013 09:51, Derek Cross wrote:
>>>>>> I understand this is to do with a keychain certificate issue and that I 
>>>>>> need
>>>>>> to delete the invalid certificate.
>>>>>> I admit I was fiddling with this utility a couple of months ago – about
>>>>>> another matter – and I presumably messed one up or something.
>>>>> 
>>>>> The message I get says that it's been flagged because the message 
>>>>> includes a digital signature, but the signature is invalid.
>>>>> 
>>>>> The signature is regarded as invalid, because it was issued by a 
>>>>> certificate authority that my system doesn't trust - ie it's not in my 
>>>>> list of trusted authorities.  The authority in question is, err, you.
>>>>> 
>>>>> In other words, you've got a self-signed certificate.  That isn't a 
>>>>> problem in itself, it's just not a useful thing to sign general emails 
>>>>> with.  So the problem isn't necessarily to be resolved in your Keychain - 
>>>>> it may be just finding the setting in Apple Mail that is currently set to 
>>>>> sign outgoing email with that certificate, and tell it not to.
>>>>> 
>>>>> ... but as I've never used Apple Mail, I've no idea where to do that, 
>>>>> sorry!
>>>>> 
>>>>> Ben
>>>>> 
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>>>> 
>>> 
>>> 
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> 
> 
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