My first job was at an investment bank. I was taught very early on that I needed to watch what I said in my emails. I'm not sure if it was true or not, but someone told me that every month, someone from compliance looked over a random selection of my emails and my manager would have been informed if they found something wrong.
What everyone on Wall Street appreciates is that your emails are a permanent record and should be treated accordingly. When there's a real risk that your emails will later turn up in court, you are gonna be a lot more careful about what you say. Even things that seem innocuous when you write them may not look good if they come under the spotlight later (something like "Hey John, the code in that repo looks messy..." may come back to bite you if it turns up in court). So I was taught to always keep to facts in emails rather than opinions ("this data set has 246 invalid phone numbers and 20 fake email addresses" is a fact... "this data looks messy" is an opinion subject to all sorts of interpretation later).
You might think that there's nothing that you have to hide. If that's true, then by all means, say what you want in your _personal_ email. But when you are using your company email, remember that you don't have many rights to privacy there and so treat it accordingly.
I once dated a lady who did data recovery and "e-discovery" for the legal department of a large corporation. A large part of her job involved grabbing disk images of people's hard drives, and then digging through them and people's email, looking for any information relevant to lawsuits, internal investigations, subpeonas, etc..
What everyone on Wall Street appreciates is that your emails are a permanent record and should be treated accordingly. When there's a real risk that your emails will later turn up in court, you are gonna be a lot more careful about what you say. Even things that seem innocuous when you write them may not look good if they come under the spotlight later (something like "Hey John, the code in that repo looks messy..." may come back to bite you if it turns up in court). So I was taught to always keep to facts in emails rather than opinions ("this data set has 246 invalid phone numbers and 20 fake email addresses" is a fact... "this data looks messy" is an opinion subject to all sorts of interpretation later).
You might think that there's nothing that you have to hide. If that's true, then by all means, say what you want in your _personal_ email. But when you are using your company email, remember that you don't have many rights to privacy there and so treat it accordingly.