postfix error

postfix is mail not sending and reply
journalctl -f | grep postfix
output;

Sep 28 19:47:58 xn–fatihyaar-62b.com.tr postfix/qmgr[25848]: 52678D0F46B5: from=deveci@devlopsoft-it.com, size=2689, nrcpt=1 (queue active)
Sep 28 19:47:58 xn–fatihyaar-62b.com.tr postfix/qmgr[25848]: warning: connect to transport private/spamassassin: Connection refused
Sep 28 19:47:58 xn–fatihyaar-62b.com.tr postfix/error[28542]: 52678D0F46B5: to=info@devlopsoft.com, relay=none, delay=394645, delays=394645/0.02/0/0.02, dsn=4.3.0, status=deferred (mail transport unavailable)
Sep 28 19:48:27 xn–fatihyaar-62b.com.tr postfix/submission/smtpd[28555]: connect from unknown[45.148.10.64]
Sep 28 19:48:27 xn–fatihyaar-62b.com.tr postfix/submission/smtpd[28555]: disconnect from unknown[45.148.10.64] ehlo=1 auth=0/1 quit=1 commands=2/3
Sep 28 19:49:23 xn–fatihyaar-62b.com.tr postfix/submission/smtpd[28555]: connect from unknown[45.148.10.60]
Sep 28 19:49:23 xn–fatihyaar-62b.com.tr postfix/submission/smtpd[28555]: disconnect from unknown[45.148.10.60] ehlo=1 auth=0/1 quit=1 commands=2/3