On Sat, Feb 28, 2015 at 08:03:28PM -0500, John R. Levine wrote:
Well, actually, it does. Every broadband network in the US currently blocks outgoing port 25 connections from retail customers.
Unfortunately, that's not entirely true. (Very) recent direct-to-MX spam from Comcast customers: 24.7.48.153 c-24-7-48-153.hsd1.ca.comcast.net 24.10.217.142 c-24-10-217-142.hsd1.ut.comcast.net 24.129.85.220 c-24-129-85-220.hsd1.fl.comcast.net 50.130.64.172 c-50-130-64-172.hsd1.tn.comcast.net 50.162.220.128 c-50-162-220-128.hsd1.fl.comcast.net 50.165.94.164 c-50-165-94-164.hsd1.il.comcast.net 50.165.121.16 c-50-165-121-16.hsd1.in.comcast.net 68.56.178.193 c-68-56-178-193.hsd1.fl.comcast.net 71.229.180.119 c-71-229-180-119.hsd1.co.comcast.net 71.234.26.63 c-71-234-26-63.hsd1.ct.comcast.net 73.47.106.185 c-73-47-106-185.hsd1.ma.comcast.net 73.163.27.108 c-73-163-27-108.hsd1.dc.comcast.net 73.171.39.246 c-73-171-39-246.hsd1.va.comcast.net 73.198.24.166 c-73-198-24-166.hsd1.nj.comcast.net 75.67.200.133 c-75-67-200-133.hsd1.ma.comcast.net 76.30.102.104 c-76-30-102-104.hsd1.tx.comcast.net 76.116.249.169 c-76-116-249-169.hsd1.nj.comcast.net 98.194.102.63 c-98-194-102-63.hsd1.tx.comcast.net 98.196.186.124 c-98-196-186-124.hsd1.tx.comcast.net 98.229.88.228 c-98-229-88-228.hsd1.ma.comcast.net 98.233.42.2 c-98-233-42-2.hsd1.md.comcast.net 98.242.32.247 c-98-242-32-247.hsd1.ca.comcast.net 107.5.40.153 c-107-5-40-153.hsd1.mi.comcast.net 174.59.200.13 c-174-59-200-13.hsd1.pa.comcast.net And Time-Warner customers: 24.25.253.81 cpe-24-25-253-81.hawaii.res.rr.com 24.27.121.156 cpe-24-27-121-156.tx.res.rr.com 24.29.64.79 cpe-24-29-64-79.nycap.res.rr.com 24.59.66.78 cpe-24-59-66-78.twcny.res.rr.com 24.88.94.165 cpe-024-088-094-165.sc.res.rr.com 24.90.21.156 cpe-24-90-21-156.nyc.res.rr.com 24.163.27.190 cpe-024-163-027-190.triad.res.rr.com 24.163.91.145 cpe-024-163-091-145.nc.res.rr.com 24.164.150.4 cpe-24-164-150-4.si.res.rr.com 24.165.29.203 cpe-24-165-29-203.hawaii.res.rr.com 24.193.228.223 cpe-24-193-228-223.nyc.res.rr.com 65.191.116.113 cpe-065-191-116-113.nc.res.rr.com 66.75.15.251 cpe-66-75-15-251.san.res.rr.com 66.108.180.35 cpe-66-108-180-35.nyc.res.rr.com 67.11.76.246 cpe-67-11-76-246.rgv.res.rr.com 67.246.130.165 cpe-67-246-130-165.stny.res.rr.com 67.252.31.129 cpe-67-252-31-129.nycap.res.rr.com 68.207.225.95 95-225.207-68.tampabay.res.rr.com 68.207.226.177 177-226.207-68.tampabay.res.rr.com 70.92.2.220 cpe-70-92-2-220.wi.res.rr.com 70.92.13.93 cpe-70-92-13-93.wi.res.rr.com 70.124.120.145 cpe-70-124-120-145.stx.res.rr.com 71.65.225.141 cpe-071-065-225-141.nc.res.rr.com 71.72.101.199 cpe-71-72-101-199.columbus.res.rr.com 72.131.3.138 cpe-72-131-3-138.wi.res.rr.com 72.133.60.75 cpe-72-133-60-75.new.res.rr.com 72.181.54.177 cpe-72-181-54-177.rgv.res.rr.com 72.181.88.187 cpe-72-181-88-187.stx.res.rr.com 72.225.154.15 cpe-72-225-154-15.nj.res.rr.com 72.227.137.8 cpe-72-227-137-8.nyc.res.rr.com 74.137.19.108 cpe-74-137-19-108.swo.res.rr.com 74.138.245.76 cpe-74-138-245-76.swo.res.rr.com 75.179.4.175 cpe-75-179-4-175.neo.res.rr.com 75.191.230.203 cpe-075-191-230-203.ec.res.rr.com 76.170.88.22 cpe-76-170-88-22.socal.res.rr.com 98.30.172.37 cpe-98-30-172-37.woh.res.rr.com 104.229.55.248 cpe-104-229-55-248.rochester.res.rr.com 107.15.246.227 cpe-107-015-246-227.nc.res.rr.com 107.184.5.61 cpe-107-184-5-61.socal.res.rr.com 108.183.132.10 cpe-108-183-132-10.maine.res.rr.com 142.105.47.206 cpe-142-105-47-206.nj.res.rr.com 142.136.44.21 cpe-142-136-44-21.socal.res.rr.com 172.248.255.13 cpe-172-248-255-13.socal.res.rr.com 173.172.110.208 cpe-173-172-110-208.kc.res.rr.com 173.172.209.8 cpe-173-172-209-8.elp.res.rr.com 174.97.185.69 cpe-174-097-185-069.nc.res.rr.com 174.98.86.73 cpe-174-098-086-073.triad.res.rr.com 184.57.187.144 cpe-184-57-187-144.cinci.res.rr.com 198.72.234.76 cpe-198-72-234-76.socal.res.rr.com 23.240.176.98 cpe-23-240-176-98.socal.res.rr.com And Charter customers: 24.107.177.229 24-107-177-229.dhcp.stls.mo.charter.com 24.179.114.97 24-179-114-97.dhcp.oxfr.ma.charter.com 24.181.102.209 24-181-102-209.dhcp.leds.al.charter.com 24.216.108.175 24-216-108-175.dhcp.spbg.sc.charter.com 24.216.126.30 24-216-126-30.dhcp.stls.mo.charter.com 24.217.26.70 24-217-26-70.dhcp.stls.mo.charter.com 68.117.145.157 68-117-145-157.dhcp.unas.al.charter.com 68.187.203.34 68-187-203-34.dhcp.ahvl.nc.charter.com 68.188.144.106 68-188-144-106.dhcp.aldl.mi.charter.com 68.190.112.8 68-190-112-8.dhcp.mdsn.wi.charter.com 71.10.113.254 71-10-113-254.dhcp.stpt.wi.charter.com 71.15.87.181 71-15-87-181.dhcp.gnvl.sc.charter.com 71.81.2.94 71-81-2-94.dhcp.ahvl.nc.charter.com 71.82.123.81 71-82-123-81.dhcp.roch.mn.charter.com 71.87.159.214 71-87-159-214.dhcp.hlrg.nc.charter.com 71.88.124.17 71-88-124-17.dhcp.jcsn.tn.charter.com 71.88.162.4 71-88-162-4.dhcp.jcsn.tn.charter.com 71.91.32.99 71-91-32-99.dhcp.leds.al.charter.com 71.93.217.124 71-93-217-124.dhcp.psdn.ca.charter.com 75.134.228.105 75-134-228-105.dhcp.oxfr.ma.charter.com 75.137.29.178 75-137-29-178.dhcp.nwnn.ga.charter.com 75.138.79.107 75-138-79-107.dhcp.gwnt.ga.charter.com 96.33.158.221 96-33-158-221.dhcp.slid.la.charter.com 97.82.153.165 97-82-153-165.dhcp.hckr.nc.charter.com 97.82.173.147 97-82-173-147.dhcp.hckr.nc.charter.com 97.84.50.56 97-84-50-56.dhcp.leds.al.charter.com 97.85.80.159 97-85-80-159.dhcp.trcy.mi.charter.com 97.87.166.194 97-87-166-194.dhcp.stls.mo.charter.com 97.91.197.125 97-91-197-125.dhcp.stls.mo.charter.com 97.93.16.32 97-93-16-32.dhcp.snlo.ca.charter.com And AT&T customers: 71.154.186.54 adsl-71-154-186-54.dsl.chcgil.sbcglobal.net 75.17.194.68 adsl-75-17-194-68.dsl.euclwi.sbcglobal.net 75.34.43.151 adsl-75-34-43-151.dsl.chcgil.sbcglobal.net 76.202.135.216 adsl-76-202-135-216.dsl.lgvwtx.sbcglobal.net 76.235.235.3 adsl-76-235-235-3.dsl.applwi.sbcglobal.net 99.24.30.126 adsl-99-24-30-126.dsl.skt2ca.sbcglobal.net 99.36.221.54 adsl-99-36-221-54.dsl.irvnca.sbcglobal.net 99.56.22.38 adsl-99-56-22-38.dsl.hstntx.sbcglobal.net 99.64.223.246 adsl-99-64-223-246.dsl.stl2mo.sbcglobal.net 99.111.46.195 adsl-99-111-46-195.dsl.kntpin.sbcglobal.net 108.193.239.68 adsl-108-193-239-68.dsl.sndg02.sbcglobal.net 108.210.134.70 adsl-108-210-134-70.dsl.wlfrct.sbcglobal.net And Cox customers: 68.15.172.92 wsip-68-15-172-92.no.no.cox.net 70.165.70.251 wsip-70-165-70-251.hr.hr.cox.net 70.168.33.228 wsip-70-168-33-228.om.om.cox.net 70.168.192.44 wsip-70-168-192-44.br.br.cox.net 72.214.51.94 wsip-72-214-51-94.hr.hr.cox.net 72.215.158.10 wsip-72-215-158-10.hr.hr.cox.net 184.180.176.180 wsip-184-180-176-180.ks.ks.cox.net 184.186.211.103 wsip-184-186-211-103.ok.ok.cox.net And...well, you get the point. ---rsk