[colesantiago]

tell them to proof read!

[viraptor]

That's not how it works if someone actually has dyslexia. They often won't be able to spot the difference.

[readthenotes1]

The two people with dyslexia that I've worked with made fewer typos than I do.

I'm not so sure dyslexia is a sufficient reason.

[gorbachev]

Hopefully a bit more diplomatically than that, though.

But, I agree. Encourage him to go over all of his work once or twice more, and use spellchecking tools, before committing or sending out email/slack/whatever.

If he's truly dyslexic, it won't necessarily help all that much, but if he's just really sloppy it most definitely will.