Docker Container set A/AAAA resource record?

Hello,
when I try to send an Email with shopwore that I installed into an docker Container I get the following error:

Requested Action not taken: mailbox unavailable. Invalid DNS MX or A/AAAA resource record

The Mailprovider gives me the following back with command “host -a example.domain”:
host -a mx00.kundenserver.de
Trying “mx00.kundenserver.de
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34158
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;mx00.kundenserver.de.		IN	ANY

;; ANSWER SECTION:
mx00.kundenserver.de.	4361	IN	A	212.227.15.41

And my docker Container this:

Trying "testshop.example.domain"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 149
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;testshop.example.domain.		IN	ANY

;; ANSWER SECTION:
testshop.example.domain.	3162	IN	MX	10 mx00.kundenserver.de.
testshop.example.domain.	3162	IN	MX	11 mx01.kundenserver.de.

Received 95 bytes from 10.0.1.1#53 in 4 ms

How can I setup an A/AAAA resource record in my docker container? So that I can send email to the Email-Provider with email address and password over smtp?