glyphs that look similar in most fonts: appIIe[.]com payaI[.]com

They look different in monospace, but I know Gmail renders plaintext mail with a normal sans-serif.

You can also just spell things mildly wrong. People often auto-correct spelling in their mind without realizing it, ex: microsott[.]com

Note I added [] to avoid linking the sites. Those domains look like they're squatted by suspicious customers already.