1. My work email
2. My "personal" email, with a silly-sounding address (see my username).
3. A professional-sounding, but non-work-affiliated email (firstname.lastname@gmail.com)
I would love to combine 2 and 3. Unfortunately, I came up with my email/username when I was 12 and didn't know any better, and I don't want it seen in professional correspondence.
I add all three to Apple Mail on my various devices, and access them from a unified inbox. The exception is my work computer (an iMac), where I could add my personal accounts but have chosen not to.