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I checked your email history and found two email addresses which landed in the bounce list:
If you are using an SMTP email address as your sender for your forms, please remove them as Yahoo! does not allow this following their DMARC policy. I would recommend to simply use the default firstname.lastname@example.org email address instead.
I also have removed the email addresses from the bounce list so your forms should send again the email alerts to them.
If none of these are the email addresses you are referring to, please let us know.