Author: Philip Blundell Date: To: Oliver Cook CC: Derrick MacPherson, exim-users Subject: Re: [Exim] Hmm. I haven't seen this one before.
>> 2001-03-29 10:42:38 rejected EHLO from [209.88.236.42]: >> syntactically invalid argument(s): ::ffff:209.88.236.42
>>
>> What is with the ::ffff: before the address?
>
>IPv6 notation?
Yes: that's how IPv4-mapped addresses are represented in IPv6 form. It's
pretty broken for another MTA to be giving its address that way in an EHLO
command.