550 5.7 1 sender id pra not permitted July 8, 2019 16 32 64 128 550 5.7 1 sender id pra not permitted exchange 2016 Led 550 5.7 1 sender id pra not permitted Smtp 550 5.7 1 sender id pra not permitted Exchange 550 5.7 1 sender id pra not permitted Reason 550 5.7 1 sender id pra not permitted Sender address rejected not owned by user
