After a few minutes I got other logged errors… a little different I guess:
Feb 1 05:53:34 host postfix/anvil[52638]: statistics: max connection rate 4/60s for (smtp:5.34.205.29) at Feb 1 05:48:46
Feb 1 05:53:34 host postfix/anvil[52638]: statistics: max connection count 1 for (smtp:85.202.169.215) at Feb 1 05:47:35
Feb 1 05:53:34 host postfix/anvil[52638]: statistics: max cache size 2 at Feb 1 05:47:58
Feb 1 05:56:42 host postfix/qmgr[1656]: DCC56BA290: from=<onlydent@host.------>, size=1125, nrcpt=1 (queue active)
Feb 1 05:56:42 host postfix/smtp[53505]: connect to mx3.34sp------[2a00:1ee0:2:8::2eb7:dfa]:25: No route to host
Feb 1 05:56:42 host postfix/smtp[53505]: connect to mx4.34sp------[2a00:1ee0:2:8::2eb7:dd0]:25: No route to host
Feb 1 05:56:42 host postfix/smtp[53505]: DCC56BA290: host mx4.34sp------[46.183.13.208] said: 450 4.1.8 <onlydent@host.------>: Sender address rejected: Domain not found (in reply to RCPT TO command)
Feb 1 05:56:42 host postfix/smtp[53505]: DCC56BA290: to=<info@------>, relay=mx3.34sp------[46.183.13.250]:25, delay=235516, delays=235516/0.02/0.24/0.04, dsn=4.1.8, status=deferred (host mx3.34sp------[46.183.13.250] said: 450 4.1.8 <onlydent@host.------>: Sender address rejected: Domain not found (in reply to RCPT TO command))
Feb 1 05:58:56 host postfix/smtpd[53561]: connect from unknown[37.49.225.111]
Feb 1 05:58:56 host postfix/smtpd[53561]: lost connection after CONNECT from unknown[37.49.225.111]
Feb 1 05:58:56 host postfix/smtpd[53561]: disconnect from unknown[37.49.225.111]
Feb 1 05:59:32 host postfix/smtpd[53561]: connect from unknown[5.34.205.29]
Feb 1 05:59:44 host postfix/smtpd[53561]: warning: unknown[5.34.205.29]: SASL LOGIN authentication failed: authentication failure
Feb 1 05:59:45 host postfix/smtpd[53561]: disconnect from unknown[5.34.205.29]
Feb 1 05:59:46 host postfix/smtpd[53561]: connect from unknown[5.34.205.29]