Re: the role of the HELO domain

Hi,

I see no need to do HELO check in SPF.
Most MTAs can do that independently already.

Setting "helo_verify_hosts= *" will cause Exim to reject mails when 
- the HELO argument is not an ip literal matching the calling address of host, and
- the host name in the HELO argument does not match a name obtained by a 
reverse lookup, and
- a lookup of the hostmname does not yield the calling host address.

Other MTAs have similar settings as well.

Regards,
Frank Segtrop