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Grok pattern additions related to following log lines:
Sep 07 07:14:19 mail1 postfix/smtpd[40744]: disconnect from unknown[unknown] commands=0/0
Sep 07 07:17:39 mail1 postfix/anvil[40746]: statistics: max connection rate 1/60s for (smtp:unknown) at Sep 7 07:14:19
Aug 31 02:08:14 mail1 postfix/smtpd[34815]: lost connection after BDAT from bid47lw.transactional.hubspotemail.net[158.247.23.50]
Aug 31 02:08:14 mail1 postfix/smtpd[34815]: disconnect from bid47lw.transactional.hubspotemail.net[158.247.23.50] ehlo=2 starttls=1 mail=1 rcpt=0/1 bdat=0/1 commands=4/6
Aug 27 18:48:55 mail1 postfix/smtp[31995]: connect to mx1.FreeBSD.org[2610:1c1:1:606c::19:1]:25: Address not available
Aug 30 13:56:20 mail1 postfix/smtp[34352]: connect to mx.impressivevalue.com[52.8.227.207]:25: Operation timed out
Sep 25 15:33:04 mail1 postfix/smtp[9922]: 745137AA: lost connection with hotmail-com.olc.protection.outlook.com[104.47.55.161] while sending RCPT TO
Oct 21 05:35:02 mail1 postfix/smtpd[36291]: disconnect from unknown[93.188.162.137] ehlo=2 starttls=1 mail=1 rcpt=0/1 rset=1 noop=1 quit=1 commands=7/8
Nov 03 09:08:48 mail1 postfix/smtp[9862]: 840197AA: host mg2.egov.bg[213.91.191.86] refused to talk to me: 450 4.3.2 try again later
Aug 27 21:57:11 mail1 postfix/verify[32135]: cache lmdb:/var/lib/postfix/verify_cache full cleanup: retained=724 dropped=6 entries
Sep 26 03:41:14 mail1 postfix/verify[10346]: cache ??????????????????????????????????? partial cleanup: retained=1 dropped=0 entries