Please change the reverse DNS entry for our static IP address to point at our domain, rather than username.plus.com as at present.
The reverse DNS record should be pointed to plusplus.uk - an A record already exists, which you can find for yourself using dig:
$ dig plusplus.uk
; <<>> DiG 9.11.5-P4-5.1+deb10u6-Debian <<>> plusplus.uk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30208
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;plusplus.uk. IN A
;; ANSWER SECTION:
plusplus.uk. 28536 IN A 195.166.150.255
