Bounce Address Tag Validation issue with TMDA
Ron Stordahl <[email protected]> Thu, 14 Aug 2014 10:05:19 -0700
| Newsgroups | gmane.mail.spam.tmda.user |
|---|---|
| Message-ID | <[email protected]> |
--===============3472926918894651236== Content-Type: multipart/alternative; boundary="31392086-98140695-1408035919=:8917" --31392086-98140695-1408035919=:8917 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I am testing TMDA as offered by a service provider.=A0 My only access to se= ttings is via TMDA-cgi.=0A=0AToday I encountered a user whose system uses B= ounce Address Tag Validation.=A0 In brief this means that his e-mail server= prefixes the "Return-Path:" address with something like: prvs-29596b788=3D= and changes this perhaps daily.=A0 As a result if that correspondent's add= ress had been validated yesterday, today it might have changed the prefix a= nd will require validation again..and again...=A0 =0A=0AA solution, requiri= ng effort, is to manually white list, replacing the BATV string with a '*'.= =A0 =0A=0AIf the validation was based instead on the "From:" address this B= ATV issue would not occur, but I suppose other issues might arise, which pr= obably would explain why "Return-Path:" was used.=0A=0ARon Stordahl=0A=A0 = =0A=A0 =A0 =A0 =A0 =A0 =0ABounce Address Tag Validation - Wikipedia, the fr= ee encyclopedia=0AIn computing, Bounce Address Tag Validation (BATV) is a m= ethod, defined in an Internet Draft, for determining whether the bounce add= ress specified in an E-mail message is valid. It is designed to reject back= scatter, that is, bounce messages to forged return addresses. =0AView on e= n.wikipedia.org Preview by Yahoo --31392086-98140695-1408035919=:8917 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable <html><body><div style=3D"color:#000; background-color:#fff; font-family:He= lveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;fo= nt-size:12pt">I am testing TMDA as offered by a service provider. My = only access to settings is via TMDA-cgi.<br><br>Today I encountered a user = whose system uses <a href=3D"http://en.wikipedia.org/wiki/BATV">Bounce Addr= ess Tag Validation.</a> In brief this means that his e-mail server pr= efixes the "Return-Path:" address with something like: prvs-29596b788=3D an= d changes this perhaps daily. As a result if that correspondent's add= ress had been validated yesterday, today it might have changed the prefix a= nd will require validation again..and again... <br><br>A solution, re= quiring effort, is to manually white list, replacing the BATV string with a= '*'. <br><br>If the validation was based instead on the "From:" addr= ess this BATV issue would not occur, but I suppose other issues might arise, which probably would explain why "Return-Path:" was used.<br><br>Ro= n Stordahl<div style=3D"width:450px; font-family: 'Georgia', 'Times', 'Time= s New Roman', 'serif';margin-top:5px; margin-bottom: 5px;" id=3D"enhancrCar= d_0" class=3D"link-enhancr-attachment link-enhancr-element" contenteditable= =3D"false"><table class=3D"link-enhancr-element" style=3D"width:450px; heig= ht:auto; position: relative; display: block;" border=3D"0" cellpadding=3D"0= " cellspacing=3D"0"><tbody><tr class=3D"link-enhancr-element"><td class=3D"= link-enhancr-element" colspan=3D"7" style=3D"height: 1px; background-color:= #e5e5e5; font-size: 1px; border-collapse: collapse;"><div class=3D"link-en= hancr-element" style=3D"height: 1px; background-color: #e5e5e5; font-size: = 1px; line-height:0px;"> </div></td></tr><tr class=3D"link-enhancr-elem= ent"><td rowspan=3D"5" class=3D"link-enhancr-element" style=3D"width: 1px; = background-color: #e5e5e5; font-size: 1pt; border-collapse: collapse;"><div= class=3D"link-enhancr-element" style=3D"width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </d= iv></td><td rowspan=3D"5" class=3D"link-enhancr-element" style=3D"width: 14= px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;">= <div class=3D"link-enhancr-element" style=3D"width: 14px; background-color:= #ffffff; font-size: 14pt;"> </div></td><td colspan=3D"2" class=3D"lin= k-enhancr-element" style=3D"height: 6px; background-color: #ffffff; font-si= ze: 0pt; border-collapse: collapse;"><div class=3D"link-enhancr-element" st= yle=3D"height: 6px; background-color: #ffffff; font-size: 6pt;"> </div= ></td><td rowspan=3D"5" class=3D"link-enhancr-element" style=3D"width: 20px= ; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><d= iv class=3D"link-enhancr-element" style=3D"width: 20px; background-color: #= ffffff; font-size: 20pt;"> </div></td><td class=3D"link-enhancr-elemen= t" rowspan=3D"5" style=3D"width: 1px; background-color: #e5e5e5; font-size:= 1pt; border-collapse: collapse;" width=3D"1"><div class=3D"link-enhancr-element" style=3D"width:= 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></td></tr><tr= ><td class=3D"link-enhancr-element" colspan=3D"2" style=3D"width: 100%; ver= tical-align: middle; font-family: 'Georgia', 'Times', 'Times New Roman', 's= erif';"><div class=3D"link-enhancr-text-part link-enhancr-element" style=3D= "line-height:16.5px; background-color: #ffffff; width: 414px;"><div class= =3D"link-enhancr-element" style=3D"word-wrap: break-word; word-break: break= -all;"><span class=3D"link-enhancr-element icon icon-shrink link-enhancr-t= oggle"></span><span class=3D"link-enhancr-element icon icon-close link-enha= ncr-delete"></span><a href=3D"http://en.wikipedia.org/wiki/BATV" class=3D"l= ink-enhancr-card-urlWrapper link-enhancr-element" style=3D"text-decoration:= none !important; color: #000000 !important; line-height: 100%; font-size: = 18px; display: block;"><span class=3D"link-enhancr-element link-enhancr-car= d-title" style=3D"margin: 0; font-weight: normal;margin-bottom: 3px; font-size: 18px; line-height: 21px= ; max-height: 43px; color: #000000; overflow: hidden !important; display: i= nline-block;">Bounce Address Tag Validation - Wikipedia, the free encyclope= dia</span></a><div style=3D"font-size: 13px; line-height: 20px; color: #999= 999; max-height: 81px; font-family: 'Georgia', 'Times', 'Times New Roman', = 'serif';overflow: hidden;" class=3D"link-enhancr-card-description link-enha= ncr-element">In computing, Bounce Address Tag Validation (BATV) is a method= , defined in an Internet Draft, for determining whether the bounce address = specified in an E-mail message is valid. It is designed to reject backscatt= er, that is, bounce messages to forged return addresses.</div></div></div><= /td></tr><tr><td colspan=3D"2" class=3D"link-enhancr-element" style=3D"heig= ht: 6px; background-color: #ffffff; font-size: 0pt; border-collapse: collap= se;"><div class=3D"link-enhancr-element" style=3D"height: 6px; background-c= olor: #ffffff; font-size: 6pt;"></div></td></tr><tr><td class=3D"link-enhancr-el= ement" style=3D"vertical-align: middle; font-family: 'Arial', 'Helvetica Ne= ue', 'Helvetica', 'sans-serif';"><div class=3D"link-enhancr-element" style= =3D"font-size: 0pt;"><a href=3D"http://en.wikipedia.org/wiki/BATV" class=3D= "link-enhancr-card-url link-enhancr-element" style=3D"color: black; text-de= coration: none !important;cursor:pointer !important;" target=3D"_blank"><sp= an class=3D"link-enhancr-element link-enhancr-view-on" style=3D"display: in= line-block; line-height: 11px; max-width: 314px; min-width: 254px; overflow= : hidden; max-height: 13px; word-break: break-all;"><span class=3D"link-enh= ancr-element link-enhancr-mobile-no-resize" style=3D"vertical-align:middle;= font-size: 9px; line-height: 11px; color: #999999; -moz-text-size-adjust: = none; -ms-text-size-adjust: none; -webkit-text-size-adjust:none; text-size-= adjust:none;">View on <span style=3D"font-weight: bold" class=3D"link-enhancr-view-on-domain">en.wikipedia.org</span></span></span= ></a></div></td><td class=3D"link-enhancr-element" style=3D"vertical-align:= middle; width: 100px; font-family: 'Arial', 'Helvetica Neue', 'Helvetica',= 'sans-serif';"><div class=3D"link-enhancr-element link-enhancr-preview-wra= pper" style=3D"max-width: 100px; min-width: 80px; overflow: hidden; text-al= ign: right; line-height: 11px; max-height: 13px; font-size: 0pt;"><span cla= ss=3D"link-enhancr-element link-enhancr-preview-by link-enhancr-mobile-no-r= esize" style=3D"vertical-align:middle; font-size: 9px; line-height: 11px; c= olor: #999999; -moz-text-size-adjust: none; -ms-text-size-adjust: none; -we= bkit-text-size-adjust:none; text-size-adjust:none;">Preview by Yahoo</span>= </div></td></tr><tr><td colspan=3D"2" class=3D"link-enhancr-element" style= =3D"height: 9px; background-color: #ffffff; font-size: 0pt; border-collapse= : collapse;"><div class=3D"link-enhancr-element" style=3D"height: 9px; back= ground-color: #ffffff; font-size: 9pt;"></div></td></tr><tr class=3D"link-enhancr-elemen= t"><td class=3D"link-enhancr-element" colspan=3D"7" style=3D"height: 1px; b= ackground-color: #e5e5e5; font-size: 1px; border-collapse: collapse;"><div = class=3D"link-enhancr-element" style=3D"height: 1px; background-color: #e5e= 5e5; font-size: 1px; line-height:0px"> </div></td></tr></tbody></table= ></div><div> </div><br><div id=3D"yiv2950078583"><div><div style=3D"c= olor:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, = Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt;"><div id=3D"yiv= 2950078583yui_3_16_0_1_1408029400080_28747"></div></div></div></div></div><= /body></html> --31392086-98140695-1408035919=:8917-- --===============3472926918894651236== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------------ --===============3472926918894651236== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ tmda-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/tmda-users --===============3472926918894651236==--