For one IMGate I admin, here's the PTR sorted by IP for mindspring/earthlink, showing the user, biz, and other PTR, done quite nicely by these people:

user-uivfh74.biz.mindspring.com[165.247.196.228]
user-uivfhui.biz.mindspring.com[165.247.199.210]
user-2ivfuj5.dialup.mindspring.com[165.247.250.101]
user-v3qtioj.biz.mindspring.com[199.174.203.19]
wan-v3qsgib.lax.biz.mindspring.com[199.174.66.75]

then the "mail" stuff, earthlink MTAs

grouse.mail.pas.earthlink.net[207.217.120.116]
albatross.mail.pas.earthlink.net[207.217.120.120]
pintail.mail.pas.earthlink.net[207.217.120.122]
harrier.mail.pas.earthlink.net[207.217.120.12]
soulshock.mail.pas.earthlink.net[207.217.120.130]
flavatown.mail.pas.earthlink.net[207.217.120.148]
epic.mail.pas.earthlink.net[207.217.120.181]
sire.mail.pas.earthlink.net[207.217.120.182]
stork.mail.pas.earthlink.net[207.217.120.188]
heron.mail.pas.earthlink.net[207.217.120.189]
goose.mail.pas.earthlink.net[207.217.120.18]
badboy.mail.pas.earthlink.net[207.217.120.20]
hawk.mail.pas.earthlink.net[207.217.120.22]
flamingo.mail.pas.earthlink.net[207.217.120.232]
mallard.mail.pas.earthlink.net[207.217.120.48]
scaup.mail.pas.earthlink.net[207.217.120.49]
avocet.mail.pas.earthlink.net[207.217.120.50]
conure.mail.pas.earthlink.net[207.217.120.54]
snipe.mail.pas.earthlink.net[207.217.120.62]
gull.mail.pas.earthlink.net[207.217.120.84]
firecrest.mail.pas.earthlink.net[207.217.121.247]

mindspring MTAs:

smtp6.mindspring.com[207.69.200.110]
granger.mail.mindspring.net[207.69.200.148]
tisch.mail.mindspring.net[207.69.200.157]
summerfield.mail.atl.earthlink.net[207.69.200.171]
johnson.mail.mindspring.net[207.69.200.177]
holt.mail.mindspring.net[207.69.200.187]
blount.mail.mindspring.net[207.69.200.226]
hitchcock.mail.mindspring.net[207.69.200.23]
fallback01.mail.atl.earthlink.net[207.69.200.240]
fallback02.mail.atl.earthlink.net[207.69.200.241]
maynard.mail.mindspring.net[207.69.200.243]
smtp10.atl.mindspring.net[207.69.200.246]
barry.mail.mindspring.net[207.69.200.25]
ebenezer.mail.atl.earthlink.net[207.69.200.40]
horace.mail.atl.earthlink.net[207.69.200.41]
hubert.mail.atl.earthlink.net[207.69.200.45]
jesse.mail.atl.earthlink.net[207.69.200.46]
mclean.mail.mindspring.net[207.69.200.57]
hall.mail.mindspring.net[207.69.200.60]

biz:

user-vc8f8ra.biz.mindspring.com[216.135.163.106]
user-vc8fei7.biz.mindspring.com[216.135.186.71]
user-vc8fh2k.biz.mindspring.com[216.135.196.84]
user-vc8fikd.biz.mindspring.com[216.135.202.141]
user-vc8fsll.biz.mindspring.com[216.135.242.181]

cable:

user-0c8h4v7.cable.mindspring.com[24.136.147.231]
user-0c8h5oq.cable.mindspring.com[24.136.151.26]
user-0c8hk4h.cable.mindspring.com[24.136.208.145]
user-0c8hss9.cable.mindspring.com[24.136.243.137]
user-0c8gkiq.cable.mindspring.com[24.136.82.90]
user-0c8glet.cable.mindspring.com[24.136.85.221]
user-0c8gls9.cable.mindspring.com[24.136.87.137]

user-uivfh74.biz.mindspring.com[165.247.196.228]
user-uivfhui.biz.mindspring.com[165.247.199.210]

user-2ivfuj5.dialup.mindspring.com[165.247.250.101]

user-v3qtioj.biz.mindspring.com[199.174.203.19]
wan-v3qsgib.lax.biz.mindspring.com[199.174.66.75]

grouse.mail.pas.earthlink.net[207.217.120.116]
albatross.mail.pas.earthlink.net[207.217.120.120]
pintail.mail.pas.earthlink.net[207.217.120.122]
harrier.mail.pas.earthlink.net[207.217.120.12]
soulshock.mail.pas.earthlink.net[207.217.120.130]
flavatown.mail.pas.earthlink.net[207.217.120.148]
epic.mail.pas.earthlink.net[207.217.120.181]
sire.mail.pas.earthlink.net[207.217.120.182]
stork.mail.pas.earthlink.net[207.217.120.188]
heron.mail.pas.earthlink.net[207.217.120.189]
goose.mail.pas.earthlink.net[207.217.120.18]
badboy.mail.pas.earthlink.net[207.217.120.20]
hawk.mail.pas.earthlink.net[207.217.120.22]
flamingo.mail.pas.earthlink.net[207.217.120.232]
mallard.mail.pas.earthlink.net[207.217.120.48]
scaup.mail.pas.earthlink.net[207.217.120.49]
avocet.mail.pas.earthlink.net[207.217.120.50]
conure.mail.pas.earthlink.net[207.217.120.54]
snipe.mail.pas.earthlink.net[207.217.120.62]
gull.mail.pas.earthlink.net[207.217.120.84]
firecrest.mail.pas.earthlink.net[207.217.121.247]

more MTAs:

smtp6.mindspring.com[207.69.200.110]
granger.mail.mindspring.net[207.69.200.148]
tisch.mail.mindspring.net[207.69.200.157]
summerfield.mail.atl.earthlink.net[207.69.200.171]
johnson.mail.mindspring.net[207.69.200.177]
holt.mail.mindspring.net[207.69.200.187]
blount.mail.mindspring.net[207.69.200.226]
hitchcock.mail.mindspring.net[207.69.200.23]
fallback01.mail.atl.earthlink.net[207.69.200.240]
fallback02.mail.atl.earthlink.net[207.69.200.241]
maynard.mail.mindspring.net[207.69.200.243]
smtp10.atl.mindspring.net[207.69.200.246]
barry.mail.mindspring.net[207.69.200.25]
ebenezer.mail.atl.earthlink.net[207.69.200.40]
horace.mail.atl.earthlink.net[207.69.200.41]
hubert.mail.atl.earthlink.net[207.69.200.45]
jesse.mail.atl.earthlink.net[207.69.200.46]
mclean.mail.mindspring.net[207.69.200.57]
hall.mail.mindspring.net[207.69.200.60]



user-vc8f8ra.biz.mindspring.com[216.135.163.106]
user-vc8fei7.biz.mindspring.com[216.135.186.71]
user-vc8fh2k.biz.mindspring.com[216.135.196.84]
user-vc8fikd.biz.mindspring.com[216.135.202.141]
user-vc8fsll.biz.mindspring.com[216.135.242.181]

user-0c8h4v7.cable.mindspring.com[24.136.147.231]
user-0c8h5oq.cable.mindspring.com[24.136.151.26]
user-0c8hk4h.cable.mindspring.com[24.136.208.145]
user-0c8hss9.cable.mindspring.com[24.136.243.137]
user-0c8gkiq.cable.mindspring.com[24.136.82.90]
user-0c8glet.cable.mindspring.com[24.136.85.221]
user-0c8gls9.cable.mindspring.com[24.136.87.137]
user-0c93078.cable.mindspring.com[24.145.128.232]
user-0c93255.cable.mindspring.com[24.145.136.165]
user-0c932eb.cable.mindspring.com[24.145.137.203]
user-0c935ka.cable.mindspring.com[24.145.150.138]
user-0c938uk.cable.mindspring.com[24.145.163.212]
user-0c93a4k.cable.mindspring.com[24.145.168.148]
user-0c93j39.cable.mindspring.com[24.145.204.105]
user-0c93mqe.cable.mindspring.com[24.145.219.78]
user-0cal61s.cable.mindspring.com[24.170.152.60]
user-0cala61.cable.mindspring.com[24.170.168.193]
user-0can4t8.cable.mindspring.com[24.171.147.168]
user-0can5b8.cable.mindspring.com[24.171.149.104]
user-0ccsk28.cable.mindspring.com[24.206.80.72]
user-0cdfd3m.cable.mindspring.com[24.215.180.118]
user-0cdvj9j.cable.mindspring.com[24.223.205.51]
user-0cej537.cable.mindspring.com[24.233.148.103]
user-0cet5dm.cable.mindspring.com[24.238.149.182]
user-0ceta0k.cable.mindspring.com[24.238.168.20]
user-0cetbtd.cable.mindspring.com[24.238.175.173]
user-0cetguh.cable.mindspring.com[24.238.195.209]
user-0cetkfu.cable.mindspring.com[24.238.209.254]
user-0cetsun.cable.mindspring.com[24.238.243.215]
user-0cev329.cable.mindspring.com[24.239.140.73]
user-0cev855.cable.mindspring.com[24.239.160.165]
user-0cevcjv.cable.mindspring.com[24.239.178.127]
user-0cevd9f.cable.mindspring.com[24.239.181.47]
user-0cevemg.cable.mindspring.com[24.239.186.208]
user-10cm5am.cable.mindspring.com[64.203.21.86]

user-10ib409.biz.mindspring.com[65.37.144.9]

user-10lf3hk.cable.mindspring.com[65.87.142.52]
user-10lf9o0.cable.mindspring.com[65.87.167.0]
user-10lff7v.cable.mindspring.com[65.87.188.255]

user-119a36t.biz.mindspring.com[66.149.12.221]
user-119b12l.biz.mindspring.com[66.149.132.85]
user-119bs6b.biz.mindspring.com[66.149.240.203]
user-119bvrs.biz.mindspring.com[66.149.255.124]
user-119a98b.biz.mindspring.com[66.149.37.11]
user-112vach.biz.mindspring.com[66.47.169.145]
user-112u4mp.biz.mindspring.com[66.47.18.217]
user-112vj7q.biz.mindspring.com[66.47.204.250]
user-112vrop.biz.mindspring.com[66.47.239.25]
user-112u69u.biz.mindspring.com[66.47.25.62]
user-112uh5q.biz.mindspring.com[66.47.68.186]

user-12hc55m.cable.mindspring.com[69.22.20.182]
user-12hc52e.cable.mindspring.com[69.22.20.78]
user-12hc6jj.cable.mindspring.com[69.22.26.115]
user-12hc8o8.cable.mindspring.com[69.22.35.8]

and here's covad, showing apparently no SMTP gateways, just "h"osts:

h-64-105-119-20.SFLDMIDN.covad.net[64.105.119.20]
h-64-105-160-171.MIATFLAD.covad.net[64.105.160.171]
h-64-105-160-172.MIATFLAD.covad.net[64.105.160.172]
h-64-105-119-20.SFLDMIDN.covad.net[64.105.119.20]
h-64-105-160-171.MIATFLAD.covad.net[64.105.160.171]
h-64-105-160-172.MIATFLAD.covad.net[64.105.160.172]
h-64-105-160-171.MIATFLAD.covad.net[64.105.160.171]
h-64-105-160-172.MIATFLAD.covad.net[64.105.160.172]
h-64-105-160-174.MIATFLAD.covad.net[64.105.160.174]
h-64-105-174-187.SNVACAID.covad.net[64.105.174.187]
h-64-105-208-14.MCLNVA23.covad.net[64.105.208.14]
h-64-105-254-175.HSTQTX02.covad.net[64.105.254.175]
h-64-105-65-215.PHNDAZ91.covad.net[64.105.65.215]
h-64-105-77-19.NYCMNY83.covad.net[64.105.77.19]
h-66-134-155-36.CHCGILGM.covad.net[66.134.155.36]
h-66-134-54-37.LSANCA54.covad.net[66.134.54.37]
h-66-134-57-81.DNVTCO56.covad.net[66.134.57.81]
h-66-134-82-74.LSANCA54.covad.net[66.134.82.74]
h-66-134-93-228.SNVACAID.covad.net[66.134.93.228]
h-66-166-188-146.SNDACAGL.covad.net[66.166.188.146]
h-66-166-205-197.SNVACAID.covad.net[66.166.205.197]
h-66-166-223-98.CHCGILGM.covad.net[66.166.223.98]
h-66-166-230-117.MCLNVA23.covad.net[66.166.230.117]
h-66-167-100-116.CHCGILGM.covad.net[66.167.100.116]
h-66-167-17-172.NYCMNY83.covad.net[66.167.17.172]
h-66-167-171-206.STTNWAHO.covad.net[66.167.171.206]
h-66-167-53-81.STTNWAHO.covad.net[66.167.53.81]
h-67-100-1-235.HSTQTX02.covad.net[67.100.1.235]
h-67-100-113-163.SNVACAID.covad.net[67.100.113.163]
h-67-100-177-242.NYCMNY83.covad.net[67.100.177.242]
h-67-100-2-115.SFLDMIDN.covad.net[67.100.2.115]
h-67-100-223-139.STTNWAHO.covad.net[67.100.223.139]
h-67-100-223-142.STTNWAHO.covad.net[67.100.223.142]
h-67-100-225-86.NYCMNY83.covad.net[67.100.225.86]
h-67-100-75-28.SNVACAID.covad.net[67.100.75.28]
h-68-164-130-174.LSANCA54.covad.net[68.164.130.174]
h-68-164-208-91.MIATFLAD.covad.net[68.164.208.91]
h-68-164-250-139.MCLNVA23.covad.net[68.164.250.139]
h-68-164-98-86.MCLNVA23.covad.net[68.164.98.86]
h-68-165-164-59.MCLNVA23.covad.net[68.165.164.59]
h-68-165-211-211.MCLNVA23.covad.net[68.165.211.211]
h-68-165-213-82.MCLNVA23.covad.net[68.165.213.82]
h-68-165-95-179.NYCMNY83.covad.net[68.165.95.179]
h-68-166-136-39.NYCMNY83.covad.net[68.166.136.39]
h-68-166-170-32.MCLNVA23.covad.net[68.166.170.32]
h-68-166-225-119.NYCMNY83.covad.net[68.166.225.119]
h-68-166-45-90.MCLNVA23.covad.net[68.166.45.90]
h-68-167-135-76.NYCMNY83.covad.net[68.167.135.76]
h-68-167-154-107.LSANCA54.covad.net[68.167.154.107]
h-68-167-167-145.MCLNVA23.covad.net[68.167.167.145]
h-68-167-20-43.NYCMNY83.covad.net[68.167.20.43]
h-68-167-34-10.CMBRMAOR.covad.net[68.167.34.10]
h-69-3-153-197.MCLNVA23.covad.net[69.3.153.197]
h-69-3-37-19.NYCMNY83.covad.net[69.3.37.19]
h-69-3-5-178.MCLNVA23.covad.net[69.3.5.178]

Len


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