When we send multipart emails to Yahoo addresses, they either bounce or
simply disappear into the universe.
When they bounce, they have an error

Remote host said: 554 Message not allowed - [299]

Looking up that error message isn't very helpful;
"You'll receive an SMTP error or failed delivery message that includes "554
Message not allowed" when the content of a message you're trying to send
violates Yahoo Mail policies. Content that violates policies includes;
objectionable links, malicious attachments, or bad header information."

I'm pretty sure the emails don't contain any objectionable links and
certainly no malicious attachments (or any attachments at all), so perhaps
there's something it doesn't like about the headers.
But how to figure that out?
Has anybody run into this, and were you able to resolve it?

Pat

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