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yesterday
mail undeliverable from all 3 of my accounts. error message
550 5.7.1 Reject for policy reason. I have not changed any settings. Had the same addresses for years. Suddenly stopped working today
yesterday - last edited 7 minutes ago
I'm getting the same with Outlook. Can receive OK, it seems. Can send to gmail.com but rejected from sky.com and .plus.com addresses as well as an organisation's own *****.org.uk address.