Having seen fairly heavy loading on our mail server today, I decided to see what might be going on. Is anyone else seeing concerted bombing from tcsender@<a couple of addresses> where the relayhost covers many hosts? I have attached a tiny bit of today's mail syslog contents below to illustrate. Approximately one third of our email traffic today has come from this. I am going to be blocking a number of the ip's at our router, due to the heavy load this is causing us. Is anyone else having to handle this nonsense (tcsender specifically) or should I be looking for someone attacking us? Thx, dennis Nov 4 04:05:48 bconnex.net sendmail[4697]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:05:48 bconnex.net sendmail[4697]: EAA04697: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@astra.genghis.com [205.139.15.34] Nov 4 04:05:54 bconnex.net sendmail[4698]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:05:54 bconnex.net sendmail[4698]: EAA04698: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=root@busche.com [206.83.162.16] Nov 4 04:05:57 bconnex.net sendmail[4703]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:05:57 bconnex.net sendmail[4703]: EAA04703: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=root@www.fredrick.com [209.113.166.92] Nov 4 04:06:04 bconnex.net sendmail[4705]: Ruleset check_mail (<tcsender@need-hits.com>) rejection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:06:04 bconnex.net sendmail[4705]: EAA04705: from=<tcsender@need-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=bay.wiznet.ca [207.139.40.1] Nov 4 04:06:08 bconnex.net sendmail[4712]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:06:08 bconnex.net sendmail[4712]: EAA04712: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@[204.254.231.160] Nov 4 04:06:22 bconnex.net sendmail[4723]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:06:22 bconnex.net sendmail[4723]: EAA04723: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@linked.net [209.24.1.201] Nov 4 04:06:27 bconnex.net sendmail[4731]: Ruleset check_mail (<tcsender@need-hits.com>) rejection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:06:27 bconnex.net sendmail[4731]: EAA04731: from=<tcsender@need-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=emke.com [204.152.178.10] Nov 4 04:06:43 bconnex.net sendmail[4758]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:06:43 bconnex.net sendmail[4758]: EAA04758: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=adzone.com [205.147.5.1] Nov 4 04:06:50 bconnex.net sendmail[4776]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:06:50 bconnex.net sendmail[4776]: EAA04776: from=<tcsender@get-more-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=[209.63.20.193] Nov 4 04:07:12 bconnex.net sendmail[4800]: Ruleset check_mail (<tcsender@need-hits.com>) rejection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:07:12 bconnex.net sendmail[4800]: EAA04800: from=<tcsender@need-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=mercury.webserve.net [206.96.226.5] Nov 4 04:07:13 bconnex.net sendmail[4802]: Ruleset check_mail (<tcsender@need-hits.com>) rejection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:07:13 bconnex.net sendmail[4802]: EAA04802: from=<tcsender@need-hits.com>, size=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@server3.homecom.com [204.198.149.6] Nov 4 04:07:16 bconnex.net sendmail[4804]: Ruleset check_mail (<tcsender@get-more-hits.com>) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:07:16 bconnex.net sendmail[4804]: EAA04804: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=metallus.ias.net [206.214.209.8] Nov 4 04:07:23 bconnex.net sendmail[4808]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:07:23 bconnex.net sendmail[4808]: EAA04808: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=france-travel.com [192.41.4.181] Nov 4 04:08:04 bconnex.net sendmail[4852]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:08:04 bconnex.net sendmail[4852]: EAA04852: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=fox.plaza.nl [195.108.180.1] Nov 4 04:08:05 bconnex.net sendmail[4858]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:08:05 bconnex.net sendmail[4858]: EAA04858: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=dnai.com [140.174.162.28] Nov 4 04:08:17 bconnex.net sendmail[4865]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:08:17 bconnex.net sendmail[4865]: EAA04865: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=virtual.icanect.net [208.202.14.126] Nov 4 04:08:45 bconnex.net sendmail[4881]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:08:45 bconnex.net sendmail[4881]: EAA04881: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=100t.lauderdale.net [207.141.140.10] Nov 4 04:09:09 bconnex.net sendmail[4895]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:09:09 bconnex.net sendmail[4895]: EAA04895: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=fred.ic2do.com [38.218.186.11] Nov 4 04:09:14 bconnex.net sendmail[4902]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:09:14 bconnex.net sendmail[4902]: EAA04902: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=ch.promega.com [198.150.28.10] Nov 4 04:09:15 bconnex.net sendmail[4905]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:09:15 bconnex.net sendmail[4905]: EAA04905: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@ns.falconsoft.com [206.112.39.112] Nov 4 04:09:28 bconnex.net sendmail[4916]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:09:28 bconnex.net sendmail[4916]: EAA04916: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@web12.ntx.net [209.1.144.158] Nov 4 04:09:45 bconnex.net sendmail[4928]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:09:45 bconnex.net sendmail[4928]: EAA04928: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@realbeer.com [204.152.97.15] Nov 4 04:09:45 bconnex.net sendmail[4929]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:09:45 bconnex.net sendmail[4929]: EAA04929: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=gost3.indirect.com [165.247.198.3] Nov 4 04:09:46 bconnex.net sendmail[4930]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:09:46 bconnex.net sendmail[4930]: EAA04930: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=[205.217.137.150] Nov 4 04:09:54 bconnex.net sendmail[4936]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:09:54 bconnex.net sendmail[4936]: EAA04936: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@jab1.roc.servtech.com [204.181.4.152] Nov 4 04:10:31 bconnex.net sendmail[4956]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:10:31 bconnex.net sendmail[4956]: EAA04956: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=wcc.wcc.net [208.6.232.10] Nov 4 04:10:45 bconnex.net sendmail[4972]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:10:45 bconnex.net sendmail[4972]: EAA04972: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@vp2.netgate.net [204.145.147.60] Nov 4 04:10:48 bconnex.net sendmail[4974]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:10:48 bconnex.net sendmail[4974]: EAA04974: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@kitchen.virtual-cafe.com 3] Nov 4 04:10:58 bconnex.net sendmail[4980]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:10:58 bconnex.net sendmail[4980]: EAA04980: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=[151.196.85.2] Nov 4 04:11:04 bconnex.net sendmail[4985]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:11:04 bconnex.net sendmail[4985]: EAA04985: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=www.fixation.com [206.144.185.101] Nov 4 04:11:06 bconnex.net sendmail[4991]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:11:06 bconnex.net sendmail[4991]: EAA04991: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=SMTP, relay=ns2.kalamazoo.net [206.31.33.2] Nov 4 04:11:26 bconnex.net sendmail[5016]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:11:26 bconnex.net sendmail[5016]: EAA05016: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=fox.plaza.nl [195.108.180.1] Nov 4 04:12:07 bconnex.net sendmail[5042]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:12:07 bconnex.net sendmail[5042]: EAA05042: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=[151.196.88.4] Nov 4 04:12:08 bconnex.net sendmail[5043]: Ruleset check_mail ) rejection: 451 <tcsender@get-more-hits.com>... Domain must resolve Nov 4 04:12:08 bconnex.net sendmail[5043]: EAA05043: from=<tcsender@get-more-hits.com>, e=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=yakko.x-statik.com [198.68.248.2] Nov 4 04:12:13 bconnex.net sendmail[5046]: Ruleset check_mail (<tcsender@need-hits.com>) jection: 451 <tcsender@need-hits.com>... Domain must resolve Nov 4 04:12:13 bconnex.net sendmail[5046]: EAA05046: from=<tcsender@need-hits.com>, class=0, pri=0, nrcpts=0, proto=ESMTP, relay=root@[140.174.206.23]