AMEX says mail has been returned as undeliverable - Verizon Community

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Ironically, I do get AMEX email and I also received the message that tells me mail has been returned undeliverable.

Called AMEX which said Verizon may have a block on AMEX addresses, contact Verizon.

I'm confused.

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I've seen similar from amex. Probably they have timeouts and retries set low. Obviously some comes through.