Request SSL certificate error because domain resolves to another ip

I have a virtual server in order only to receive my mail because website locates to another server. So i have an A record that points to the server which my website locates. The problem is that when i request a SSL certificate for mail.mydomain.com i receive the following error message

Validating configuration for mydomain.com .. .. errors were found, which will prevent Let's Encrypt from issuing a certificate : BIND DNS domain : The DNS record mydomain.com. resolves to the IP address xxx.xxx.xxx.xxx instead of the virtual server's IP xxx.xxx.xxx.xxx.

Why this happen? I request SSL only for mail.mydomain.com not for www.mydomain.com and mydomain.com

Can i skip this error?

Thank you

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Comments

You can skip the validation check when requesting a Let's Encrypt cert for the domain.