PTR and MX records 1 IP multiple domains for emails

aaP_erikator

I have 1 IP with multiple domains for emails. My IP is pointed to mail.domain1.com. From what i have heard, there can be only 1 IP per domain. So that IP cant point to domain2. So what should i use

domain2.com. IPaddress A -- 600
domain2.com. mail.domain2.com. MX 10 600

Is this correct?

Or should it be

domain2.com. IPaddress A -- 600
domain2.com. mail.domain1.com. MX 10 600

aaPanel_Kern

Hello, MX records or A records can use the same IP.
PTR records generally correspond to one IP and one domain name.