Reason 552 message size exceeds fixed limit July 8, 2019 16 32 64 128 (reason 552 message size exceeds fixed limit) (reason 552 5.3.4 message size exceeds fixed limit Reason 552 5.3 4 message size exceeds fixed limit Reason 552 message size exceeds fixed limit 意味 Reason 552 5.3.4 message size exceeds fixed limit 意味
