multiple IP addresses SMTP helo values for

orthohin — Mon, 12 Nov 2012 17:21:24 GMT

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

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multiple IP addresses SMTP helo values for