Edgar Pettijohn wrote:
> On 02/21/15 18:09, trondd wrote:
> > On 2015-02-21 18:57, Martin Brandenburg wrote:
> >> That doesn't mean you can't find the information somewhere else.
> >>
> >
> > I just did this for gmail by simply sending a couple emails, letting 
> > gmail retry for a couple hours and grabbing the IPs out of spamdb.
> >
> > Tim.
> >
> $ host yahoo.com
> yahoo.com has address 98.138.253.109
> yahoo.com has address 98.139.183.24
> yahoo.com has address 206.190.36.45
> yahoo.com mail is handled by 1 mta5.am0.yahoodns.net.
> yahoo.com mail is handled by 1 mta6.am0.yahoodns.net.
> yahoo.com mail is handled by 1 mta7.am0.yahoodns.net.
>
> $ nslookup mta5.am0.yahoodns.net
> Server:         192.168.1.1
> Address:        192.168.1.1#53
>
> Non-authoritative answer:
> Name:   mta5.am0.yahoodns.net
> Address: 66.196.118.34
> Name:   mta5.am0.yahoodns.net
> Address: 66.196.118.36
> Name:   mta5.am0.yahoodns.net
> Address: 98.136.216.25
> Name:   mta5.am0.yahoodns.net
> Address: 66.196.118.35
> Name:   mta5.am0.yahoodns.net
> Address: 98.136.216.26
> Name:   mta5.am0.yahoodns.net
> Address: 98.138.112.35
> Name:   mta5.am0.yahoodns.net
> Address: 98.138.112.32
> Name:   mta5.am0.yahoodns.net
> Address: 98.138.112.37
>
> so on and so forth for the following mta's.  add the ip's to your 
> whitelist and it should be good to go.
>
>

Just because you send mail to Yahoo through those IPs doesn't mean they
send mail to you from those IPs. It's not unheard of for incoming and
outgoing mail to go through different servers once you get to a certain
size.

(It may well be that they do go through the same servers. A lot of this
is guesswork anyway without information direct from the source.)

-- Martin

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