Try this:
*** ./src/smtpd/smtpd.c- 2019-03-30 08:05:29.000000000 -0400 --- ./src/smtpd/smtpd.c 2019-04-03 08:26:07.000000000 -0400 *************** *** 3598,3604 **** if (state->err == 0) { why = vstring_alloc(10); state->err = mail_stream_finish(state->dest, why); ! printable(STR(why), ' '); } else mail_stream_cleanup(state->dest); state->dest = 0; --- 3598,3604 ---- if (state->err == 0) { why = vstring_alloc(10); state->err = mail_stream_finish(state->dest, why); ! // printable(STR(why), ' '); } else mail_stream_cleanup(state->dest); state->dest = 0;