On 18 Jul 2020, at 7:12, Stefan Bauer via mailop wrote:
No. Recipient is valid. Unknown recipients should be a perament error.
I am seeing what seems to be user lookup issues on their end from a few
servers. Specifically
Server Too Busy (TT101)
Recipient Lookup Failed (TT513)
I have a couple samples that were delivered ~24 hours ago, and are
failing with the errors above now.
I also tried postmaster@ and get same TT513 error.
The examples I picked at random are for domains served by tiscali.co.uk.
Best regards
-lem
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