Smells like phishing to me :)
An email trying to pass as a normal workplace email.
An email trying to pass as a normal workplace email.
It was years ago but IIRC, there were actual names and the email was clearly between two people who knew each other personally, contained phone numbers, etc. Also, it wasn't in English, so it wasn't some automated Nigerian scam or something like that for sure.
And if someone went through the trouble of obtaining so much intel (names, phones, company titles, bank branches, etc) - makes no sense they would then get the email wrong.
Also, at most the person sending the email would gain is some business bank account number, that's probably semi public knowledge anyway, without any authentication-enabling information.
This stuff is done by fax in my country to this very day, I'm not surprised at all that such an unencrypted mail was sent.
Names, addresses, social security numbers, etc.
Typically inside a company (like a bank) there's an email client with a preconfigured contacts list linked to an AD server, the email client will write the email address for you.
So the probability of someone mistyping an email address inside the same company is, I'd say, low. Even lower if it's a recuring contact between two persons who know each others.
That's what's smelling here. You don't mispell an email address when you're replying or sending a message to someone you have an ongoing conversation with.
And if you receive that kind of email from outside the company... Well. That's phishing.
Also, for clarification, 12345678 wasn't the actual number, it was something that looked completely legit.