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 550 5.7 1 sender id pra not permitted exchange 2016 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 550 5.7.1 sender id (pra) not permitted ошибка
