Postfix: Hostname not resolving to IP

Installed MiaB on a fresh server, been up for 3 days now.
No custom DNS entries.
All status green in ctrl panel (except I permit password login.)

box.my.com
✓ Nameserver glue records are correct at registrar. [ns1/ns2.box.my.com ↦ 159.XXX.4.142]
✓ Domain resolves to box’s IP address. [box.my.com ↦ 159.XXX.4.142]
✓ Reverse DNS is set correctly at ISP. [159.XXX.4.142 ↦ box.my.com]

Output from mail.log

Aug 26 03:00:06 box postfix/smtpd[15614]: warning: hostname box.my.com does not resolve to address 159.XXX.4.142
Aug 26 03:00:06 box postfix/smtpd[15614]: connect from unknown[159.XXX.4.142]
Aug 26 03:00:06 lmtp(15817): Info: Disconnect from 127.0.0.1: Connection closed (in banner)
Aug 26 03:00:06 box postfix/smtpd[15614]: lost connection after CONNECT from unknown[159.XXX.4.142]
Aug 26 03:00:06 box postfix/smtpd[15614]: disconnect from unknown[159.XXX.4.142]
Aug 26 03:00:06 managesieve-login: Info: Disconnected (no auth attempts in 0 secs): user=<>, rip=159.XXX.4.142, lip=159.XXX.4.142, secured, session=<Pqk
6lPY6gACfywSO>
Aug 26 03:00:06 box postfix/submission/smtpd[15820]: warning: hostname box.mys.com does not resolve to address 159.XXX.4.142
Aug 26 03:00:06 box postfix/submission/smtpd[15820]: connect from unknown[159.XXX.4.142]
Aug 26 03:00:06 box postfix/submission/smtpd[15820]: lost connection after CONNECT from unknown[159.XXX.4.142]
Aug 26 03:00:06 box postfix/submission/smtpd[15820]: disconnect from unknown[159.XXX.4.142]
Aug 26 03:00:06 imap-login: Info: Disconnected (no auth attempts in 0 secs): user=<>, rip=159.XXX.4.142, lip=159.XXX.4.142, TLS handshaking: Disconnecte
d, session=

What do I need to do to fix this? Is anyone else seeing this on their MiaB server?

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