So: "I noticed that your email had a slightly sarcastic ring to it, I feel a bit unhappy about this, I want communications with external contacts to remain professional, can you review tone and content for anyone outside of our company"
In that case, rather than bringing my feelings into it which implies that you interpreted it that way I would suggest something like this:
"Your email had appeared to have a slightly sarcastic ring to it, while everyone interprets sarcasm differently I found it to be unprofessional towards the clients, can you please ensure that you review the tone of your emails such that they're not misunderstood?
Saying you're unhappy about it sounds weak and emotional in this context. Happiness isn't expected from an email in this context.
As a note: Grammarly says this is 4/5 in terms of formality (very strong intensity) and dishearting 2/5 (moderate intensity).
Happiness isn't expected from an email in this context
What I mean to say is that I, personally would be unsatisfied (unhappy) with sarcasm as a tone towards a client.
I found it to be unprofessional towards the clients,
It is not always understood that it is bad to be "unprofessional towards the clients", do not take it for granted that everyone knows that. In fact this person in the original example probably did not.
In my experience, while internally, one can be informal, even joke a bit and still be respected for technical ability, it is necessary to take a more formal approach outside of the org in order to be taken seriously.
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So: "I noticed that your email had a slightly sarcastic ring to it, I feel a bit unhappy about this, I want communications with external contacts to remain professional, can you review tone and content for anyone outside of our company"
In that case, rather than bringing my feelings into it which implies that you interpreted it that way I would suggest something like this:
"Your email had appeared to have a slightly sarcastic ring to it, while everyone interprets sarcasm differently I found it to be unprofessional towards the clients, can you please ensure that you review the tone of your emails such that they're not misunderstood?
Saying you're unhappy about it sounds weak and emotional in this context. Happiness isn't expected from an email in this context.
As a note: Grammarly says this is 4/5 in terms of formality (very strong intensity) and dishearting 2/5 (moderate intensity).
Slightly different meanings there:
What I mean to say is that I, personally would be unsatisfied (unhappy) with sarcasm as a tone towards a client.
It is not always understood that it is bad to be "unprofessional towards the clients", do not take it for granted that everyone knows that. In fact this person in the original example probably did not.
In my experience, while internally, one can be informal, even joke a bit and still be respected for technical ability, it is necessary to take a more formal approach outside of the org in order to be taken seriously.