I don't think I have this right

mail to @mydomain.co.uk is disappearing into a black hole with no undeliverable messages
dig mydomain.co.uk
;; QUESTION SECTION:
;mydomain.co.uk. IN A
;; ANSWER SECTION:
mydomain.co.uk. 10127 IN A 82.xxx.xxx.xxx (webhost IP I believe)
;; AUTHORITY SECTION:
mydomain.co.uk. 122671 IN NS ####.1and1.co.uk. (webhosts name servers)
mydomain.co.uk. 122671 IN NS ####.1and1.co.uk.
;; ADDITIONAL SECTION:
####.1and1.co.uk. 85828 IN A 195.xx.xx.xx (1&1 IP's ?? )
####.1and1.co.uk. 85828 IN A 212.xx.xx.xx
dig mx mydomain.co.uk
;; QUESTION SECTION:
;mydomain.co.uk. IN MX
;; ANSWER SECTION:
mydomain.co.uk. 36051 IN MX 10 mx$$$$.1and1.co.uk. (looks like this is the 1&1 mail server?)
mydomain.co.uk. 36051 IN MX 10 mx$$$$.1and1.co.uk.
;; AUTHORITY SECTION:
mydomain.co.uk. 122451 IN NS ####.1and1.co.uk.
mydomain.co.uk. 122451 IN NS ####.1and1.co.uk.
;; ADDITIONAL SECTION:
####.1and1.co.uk. 85608 IN A 195.xx.xx.xx
####.1and1.co.uk. 85608 IN A 212.xx.xx.xx
dig mail.mydomain.co.uk
;; QUESTION SECTION:
;mail.mydomain.co.uk. IN A
;; ANSWER SECTION:
mail.mydomain.co.uk. 85412 IN A 79.xxx.xxx.xxx (My exchange server's IP)
;; AUTHORITY SECTION:
mydomain.co.uk. 122255 IN NS ####.1and1.co.uk.
mydomain.co.uk. 122255 IN NS ####.1and1.co.uk.
;; ADDITIONAL SECTION:
####.1and1.co.uk. 85412 IN A 195.xx.xx.xx
####.1and1.co.uk. 85412 IN A 212.xx.xx.xx
dig mx mail.mydomain.co.uk
;; QUESTION SECTION:
;mail.mydomain.co.uk. IN MX
;; ANSWER SECTION:
mail.mydomain.co.uk. 85040 IN MX 5 mail.mydomain.co.uk.
;; AUTHORITY SECTION:
mydomain.co.uk. 121939 IN NS ####.1and1.co.uk.
mydomain.co.uk. 121939 IN NS ####.1and1.co.uk.
;; ADDITIONAL SECTION:
mail.mydomain.co.uk. 85096 IN A 79.xxx.xxx.xxx (My exchange server IP)
####.1and1.co.uk. 85096 IN A 195.xx.xx.xx
####.1and1.co.uk. 85096 IN A 212.xx.xx.xx