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Wow I never expected a website in 2025 to be coded to reject email addresses can contain full stops/periods in the local-part, but the IHG website certainly does.
@renbymon Yahoo recently made changes to their e-mail acceptance policies which makes it very difficult to actually reliably send anything to yahoo addresses, that might be why.
@fatedfox Oh haha that might explain it then.
Uggghh trying to get away from gmail is so annoying x)
wait no; I was wrong
It says that all yahoo email addresses are invalid xD