If our SMTP servers uses multiple IP addresses for send email, is necessary that each IUP address has associated a specific HELO value?
For example, our SMTP server has these 2 IPs: 1.1.1.1 and 1.1.1.2. Is possible to share the same HELO name, e.g.: mailserver.example.com or I have to create a mailserver1.example.com when the SMTP server send mails by the IP 1.1.1.1 and mailserver2.example.com when it send mails by the IP 1.1.1.2?
If I can share the same HELO name (mailserver.example.com) for all my IPs then I have to create PTR records from each our IPs to mailserver.example.com, this will not cause any problem having multiple IP addresses pointing to the same host name?
I know the RFC can accept any value for the HELO command, but I know if you don't send the appropriate data your email may be cataloged as SPAM.
Thanks
