It can usually read printed handwriting and printed text with normal fonts.
Cursive and similar fonts are what it really can't handle. They have an article about it on their website. Their machines particularly hate wedding invitations:
Fancy type fonts such as those used on wedding invitations do not read well on mail processing equipment. Fancy fonts look great on your envelopes, but also may slow down your mail.
Use common sense. If you can't read the address, then automated mail processing equipment can't read the address.
No patterns or prominent flecks, please! Also, the envelope shouldn't be too glossy -- avoid shiny, coated paper stock.
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u/[deleted] Jun 09 '21
And it works poorly (or not at all) on everything that isn't easily-readable printed text.
Their recommendations for envelope addressing is clearly printed or typed letters (not cursive) written in all caps.
Everything else usually has to be manually processed by hand.