Provisioning DANE-TA(2) TLSA records for Let's Encrypt CAs.

Some mail servers (MX hosts) have associated TLSA records with certificate usage 2 (DANE-TA) that match one of the retired Let's Encrypt issuer CAs. The retired CAs include:

All certificates issued to DANE MX hosts by the "X1", "X2", "X3" and "X4" intermediate issuing CAs have long ago expired. As of 2024-09-03, so have those issued by the "R3", "R4", "E1" and "E2" issuing CAs. Finally, as of 2025-11-18, so have those issued by "R10", "R11", "E5" and "E6".

See below for the list of associated "2 1 1" records to avoid.

Please note that additional changes are planned at Let's Encrypt, with new root and intermediate CAs to be phased in by June 2026. See the announced plans and new issuer details. You should monitor your systems carefully, keep informed of changes at Let's Encrypt, and be sure to publish updated TLSA records prior to deployment of certificates from the new CAs.

When you do publish TLSA records matching a Let's Encrypt issuing CA, make sure to publish the full set of records for ALL the related CAs:

All Let's Encrypt users publishing DANE-TA(2) TLSA records need to update their TLSA records to publish records that match the intermediate issuer CAs that issued their current certificate and to pre-publish records for upcoming CAs if the current issuer is no longer active.

If your server's private and public keys are RSA keys, you can publish TLSA records matching just the "R*" CA public keys, and with ECDSA keys, just the "E*" CA public keys. If your server has both RSA and ECDSA keys, you'll need to publish TLSA records matching both the "R*" and "E*" issuer CAs. You can't rely on certificate renewal always using the same intermediate CA as before, or that the backup issuers might not be used instead. Therefore, list all "R*" and/or "E*" records. See the tables below for details.

Thus, SMTP server operators using DANE-TA(2) with Let's Encrypt certificates must publish the applicable groups of TLSA records from the below (possibly in addition to "3 1 1" records matching the server public key) for each of their MX hosts in order to prevent delivery failures.

CA tagActive RSA issuer CAs
R12_25._tcp.each.mx.host. IN TLSA 2 1 1 919c0df7a787b597ed056ace654b1de9c0387acf349f73734a4fd7b58cf612a4
R13_25._tcp.each.mx.host. IN TLSA 2 1 1 025490860b498ab73c6a12f27a49ad5fe230fafe3ac8f6112c9b7d0aad46941d
R14_25._tcp.each.mx.host. IN TLSA 2 1 1 f1647a5ee3efac54c892e930584fe47979b7acd1c76c1271bca1c5076d869888
YR11_25._tcp.each.mx.host. IN TLSA 2 1 1 2e8307068b6db620e4a39d068b5dee5d6ef5788cbb2c0b6d23ead84fcc17178c
YR21_25._tcp.each.mx.host. IN TLSA 2 1 1 9d637b3d27a9e570d07607b9ccadb80a70915c7af72afce12841b1b1da825fd1
YR31_25._tcp.each.mx.host. IN TLSA 2 1 1 51aaa87d984b559ac69e929f888a022d832e089ff4dba0a412b5101bca4bc799

1Slated to replace R12, R13, R14 by June 2026.

CA tagActive ECDSA issuer CAs
E7_25._tcp.each.mx.host. IN TLSA 2 1 1 cbbc559b44d524d6a132bdac672744da3407f12aae5d5f722c5f6c7913871c75
E8_25._tcp.each.mx.host. IN TLSA 2 1 1 885bf0572252c6741dc9a52f5044487fef2a93b811cdedfad7624cc283b7cdd5
E9_25._tcp.each.mx.host. IN TLSA 2 1 1 f1440a9b76e1e41e53a4cb461329bf6337b419726be513e42e19f1c691c5d4b2
YE12_25._tcp.each.mx.host. IN TLSA 2 1 1 6ebcefb4210b088654a38b03fea3d7d1c711b4fb1ddc363a45f9b1a4e53da01e
YE22_25._tcp.each.mx.host. IN TLSA 2 1 1 b3fb5d00e994cddf2cc9a4eea9f806bc5727e83cc0e4299bf956f2d524fe5376
YE32_25._tcp.each.mx.host. IN TLSA 2 1 1 a698a20824be04e47a1a33c4fa488731be92011f23a31e900e2ca26c9c2acfce

2Slated to replace E7, E8, E9 by June 2026.

Any other "2 1 1" records that were once associated with Let's Encrypt SHOULD NOT be used. They can't possibly match an unexpired certificate, and are just bloat in DNS TLSA lookup results, and an unnecessary security risk (if the obsolete keys are compromised). These include:

CA tagRetired issuer CAs to avoid
X1/X3_25._tcp.each.mx.host. IN TLSA 2 1 1 60b87575447dcba2a36b7d11ac09fb24a9db406fee12d2cc90180517616e8a18
X2/X4_25._tcp.each.mx.host. IN TLSA 2 1 1 b111dd8a1c2091a89bd4fd60c57f0716cce50feeff8137cdbee0326e02cf362b
R3_25._tcp.each.mx.host. IN TLSA 2 1 1 8d02536c887482bc34ff54e41d2ba659bf85b341a0a20afadb5813dcfbcf286d
R4_25._tcp.each.mx.host. IN TLSA 2 1 1 e5545e211347241891c554a03934cde9b749664a59d26d615fe58f77990f2d03
R10_25._tcp.each.mx.host. IN TLSA 2 1 1 2bbad93ab5c79279ec121507f272cbe0c6647a3aae52e22f388afab426b4adba
R11_25._tcp.each.mx.host. IN TLSA 2 1 1 6ddac18698f7f1f7e1c69b9bce420d974ac6f94ca8b2c761701623f99c767dc7
E1_25._tcp.each.mx.host. IN TLSA 2 1 1 276fe8a8c4ec7611565bf9fce6dcace9be320c1b5bea27596b2204071ed04f10
E2_25._tcp.each.mx.host. IN TLSA 2 1 1 bd936e72b212ef6f773102c6b77d38f94297322efc25396bc3279422e0c89270
E5_25._tcp.each.mx.host. IN TLSA 2 1 1 3586d4ecf070578cbd27aedce20b964e48bc149faeb9dad72f46b857869172b8
E6_25._tcp.each.mx.host. IN TLSA 2 1 1 d016e1fe311948aca64f2de44ce86c9a51ca041df6103bb52a88eb3f761f57d7

For the Let's Encrypt CAs, please also avoid all TLSA parameter combinations other than "2 1 1", with an associated SHA2-256 digest of the CA public key (not the full certificate).

MX hosts whose TLSA records include only inactive CA key digests are no longer able to receive email from sending systems that perform DANE validation.

TLSA records for root CAs

With a bit of care, one can instead publish TLSA records matching one of the "ISRG X1" or "ISRG X2" root CAs, but one then has to carefully ensure that the root CA certificates are appended to the server's chain file (not the case with chain files produced by, e.g., certbot), so the ACME chain file may require post-processing before it is configured as the MTA's certificate chain. The root CA public key hashes are:

CA tagISRG Root CAs
ISRG X1_25._tcp.each.mx.host. IN TLSA 2 1 1 0b9fa5a59eed715c26c1020c711b4f6ec42d58b0015e14337a39dad301c5afc3
ISRG X2_25._tcp.each.mx.host. IN TLSA 2 1 1 762195c225586ee6c0237456e2107dc54f1efc21f61a792ebd515913cce68332
ISRG YR3_25._tcp.each.mx.host. IN TLSA 2 1 1 7e4e8838a8add6295de7ae3b047d3aba3488ab95db0a0aa56d897a00d8618bcf
ISRG YE3_25._tcp.each.mx.host. IN TLSA 2 1 1 b0292ae545978e0fbb98abbd94c861605e5b18bb32ed523f50d5b7b5c71d47bc

3Initially cross-signed by ISRG X1 and ISRG X2, respectively.

Of course even the above root CA TLSA records are not safe to then indefinitely ignore, the roots are also subject to occasional bitrot. Only the "3 1 1" records matching your server's public keys are under your control and change only when *you* decide to switch to new keys.

Hence, my best advice is to not play Let's Encrypt whack-a-mole, and use "3 1 1" records with stable keys (not automatically replaced with every renewal). You should choose when to rekey, and prepublish matching TLSA records before you do so. You may find danebot or similar tools helpful.

Finally, please avoid issuer TLSA records with selector Cert(0), i.e. "2 0 1" and "2 0 2". These are much more fragile, for example, some of the "E*" certificates will be issued by the RSA "X1" root, while others by the newer ECDSA "X2" root.

MX hosts with TLSA records for retired Let's Encrypt CAs

The table below lists MX hosts that are still publishing TLSA records matching the retired "X1", "X2", "X3", "X4", "R3", "R4", "E1" or "E2" CAs as well as the outdated R3 or R4 cross-certificates issued by DST. It is sorted to list hosts that serve the most domains first.

signed domainshost name
18833mail.lima-city.de
11560mx1.vevida.com
11557mx2.vevida.com
11556mx3.vevida.com
11550mx4.vevida.com
11544backup-mx.vevida.com
10889mx1.simplelogin.co
10885mx2.simplelogin.co
9704mail.wido.info
1172h11.mijn.host
1139h19.mijn.host
1066h9.mijn.host
964h15.mijn.host
911h20.mijn.host
911h17.mijn.host
904h14.mijn.host
893h18.mijn.host
818h3-da.mijn.host
757h16.mijn.host
734h8.mijn.host
695h13.mijn.host
644h10.mijn.host
629h12.mijn.host
572mail.srvfarm.net
524h6-da.mijn.host
456h7.mijn.host
425h4-da.mijn.host
216email-anywhere.nl
166mx02.kdmails.de
166mx01.kdmails.de
165mx03.kdmails.de
106spm02.cloudvoor.nl
106s1.webhost.company
105spm01.cloudvoor.nl
67s3.webhost.company
66h37.mijn.host
66ecn3.ecn.cz
65h44.mijn.host
64h40.mijn.host
62ecn4.ecn.cz
59h43.mijn.host
55s2.webhost.company
53web2.sys.ccs-baumann.de
53web1.sys.ccs-baumann.de
51mail.netfuture.ch
50mx2.amsterdamtech.net
50mx1.amsterdamtech.net
49h34.mijn.host
48h39.mijn.host
48h38.mijn.host
47vps.greenbull.it
47mail.ncsc.de
46mx1.webmeneer.net
46mx2.webmeneer.net
45h36.mijn.host
44h33.mijn.host
42h27.mijn.host
42luna.soulianis.com
42merlin.cutisan.dk
40mail.sciver.net
40frodo.akxnet.de
40h45.mijn.host
39dus.50k30.de
38h29.mijn.host
38h35.mijn.host
38h48.mijn.host
36thoth.cutisan.net
36mx3.vos-systems.net
36mx4.vos-systems.net
36s5.webhost.company
36svr2.it-df.net
36svr1.it-df.net
36svr4.it-df.net
36svr3.it-df.net
36mx2.vos-systems.net
34s4.webhost.company
34h30.mijn.host
31h50.mijn.host
30h31.mijn.host
30nc.hitco.at
29h55.mijn.host
29mx2.ernstberger.cloud
28mail12.imapserver.dk
28h47.mijn.host
27h32.mijn.host
27h46.mijn.host
26mx1.vos-systems.net
26h41.mijn.host
25h54.mijn.host
25smtp3.muehlberger.net
24mailproxy.nynex.de
23h52.mijn.host
22mail.raksha.ch
21h42.mijn.host
20in4smtp.std-service.com
20h51.mijn.host
19smtp.std-service.com
19h21.mijn.host
19mx2.mchosted.nl
18mail.sysnull.net
18mx2.ha-vel.cz
18mx-02.beastie.de
18mx-01.beastie.de
18smtp.astrath.net
17s6.webhost.company
17mail.gadecs.com
17h49.mijn.host
16mx1.vereinshosting.ch
16s7.webhost.company
16hosting03.spotler.net
15mx2.vereinshosting.ch
15r2-d2.snakeoil.de
15c-3po.snakeoil.de
15bb-8.snakeoil.de
15mail.leonklingele.de
15alt1.mail.leonklingele.de
15artemis.strebsjig.net
15mail.sig-io.nl
15mail.laesche.net
15alt2.mail.leonklingele.de
15alt3.mail.leonklingele.de
15alt4.mail.leonklingele.de
15h53.mijn.host
15a.mx.mb-net.net
15d.mx.mb-net.net
15c.mx.mb-net.net
15b.mx.mb-net.net
14h5-da.mijn.host
14mail.ragnatela.com.br
14mail.laesche.eu
13mx-5.magellanic.eu
13mx-13.magellanic.eu
13mail.deady.space
12mail.raven.express
12mx.masterdeb.de
12mail.twe.net
11mailv4.davizone.at
11mail.davizone.at
11mailv6.davizone.at
11h56.mijn.host
10mail.yzal.io
10huaxal.midgard-muenchen.de
10mail.ideas-in-logic.de
10mail.jedi-it.de
10norica.jaggi.info
10mx.uppenbrink.net
10hg.net2service.com
10mail.profidea.cz
10mail.herenstraat.nl
10lotus.huppelrecords.nl
10mx1.serv-cloud.com
10mxe1.detack.de
10mxe2.detack.de
10mx2.serv-cloud.com
10s10.webhost.company
10mail.sportvereine.online
9thylacine3.cfaerber.name
9mx3.vforge.net
9mx2.vforge.net
9mx1.vforge.net
9s9.webhost.company
9emilia.zenti.cloud
9mx2.tlshost.net
9mail.server-schwabe.de
8mx.prozserin.org
8mail.dohd.org
8any.qu1x.one
8mail.chas.se
8mx2.slxh.eu
8c01.escapebox.net
8mail.matthiashille.com
8mail.pr0.tech
8mail.saftware.de
8amail.ha-vel.cz
8mail.neef-media.com
8mail.niklas-abel.de
7mx.01x.eu
7mail.dadosch.de
7mail.vpmsite.net
7syndace.email
7mailbackup.d9ping.nl
7meow.host.mau.fi
7mail.swiss-link.net
7rx-0.ch-dk-2.simpoly.ch
7mail2.jedi-it.de
7insblauehinein.nl
7blackbird.minded.net
7rx-0.ch-gva-2.simpoly.ch
7mx1.mailserver.ovh
6mail.blep.cz
6box2.tolerantnetworks.com
6mx01.mindorf-online.de
6ibio.nl
6mx2.sys.ccs-baumann.de
6mail.spookje.org
6mail.datenreisen.ch
6smtp.delaat.net
6mail.efflam.net
6ncars.douzer.de
6mail.4my.page
6mail.w4w.de
6scanner.alderneyconsoles.co.uk
6smtp.koeroo.net
6mx1.privatemail.dk
6mx2.privatemail.dk
6mail.evangineer.net
6mx.ojaehrling.de
6lcars.douzer.de
6mail.js86.de
6mail.qyouton.com
6dev.koan19.net
6mail.ffct.eu
5mail.leemankuiper.nl
5mail.accolon.de
5mailx.bhatia.eu
5mail.tdlt.ch
5mail0.brain-offload.de
5mail.seelentium.de
5pmg.ebbs.nl
5mail.behindthemoon.net
5mta02.kleckerbox.link
5postbox.idefix.net
5mail.mxgateway.eu
5w1.mijn.website
5mx1.cgnf.net
5mx1.darvo.nl
5mx2.darvo.nl
5mx.hutspot.email
5mta01.kleckerbox.link
5mx1.nerdpol.org
5mail.kglobal.llc
5mail.newday.host
5smtp.maths.network
5mail.effectivemomentum.com
5mx2.ftcz.net
5mail.twwd.de
5mail.kestrel.institute
5mx0.ipmorris.net
5mailmib.hlrs-lamusse.net
5mail.msk.pub
5mail.lucalab.eu
5mx1.urandom.ca
5smtp.meekorah.net
5mx1.ipmorris.net
5mail2.brain-offload.de
4mail.birdee.at
4mail.continens.cloud
4ampersand.cgx.me
4mail.windgucker.de
4gate02.masgalor.de
4gate01.masgalor.de
4mail.coldlogic.net
4mx2.urandom.ca
4mail.rkfomh.net
4mx1.riseup.net
4mx.coldlogic.io
4mail.efag.com
4mail.abdene.dk
4mail.lampenlurch.de
4mars.kerschersys.de
4mail.yobagame.com
4mail.jtebruegge.de
4mail.geneberg.net
4mail.records.sh
4mail.petabits.de
4smtp.s2net.ch
4mx01.socotec.de
4mail.lecody.com
4de1.colincogle.name
4mail.binksma.de
4chaos.olympe.lurenzu.org
4sternschnuppe.bofh-noc.de
4mx.boxencrypt.com
4mail.frykholm.com
4mail.itzer.de
4smtp.hs-bund.de
4eu.colincogle.name
4useast.colincogle.name
4mail.cyberplayer.de
4mail.kehlenbach.net
4mail.region46.de
4turing.lentil.org
4mail.flox.org
4sw.6t-zq.com
4devold.4f.no
4gorki.wkraft.org
4s11.webhost.company
4mail.niclasjonsson.nu
4promethee.olympe.lurenzu.org
3mx2.alotof.it
3mail.tassoni.net
3mta.wasteland.co
3mail.goik.de
3node1.projektzentrisch.de
3mx3.alotof.it
3mail.netfreax.de
3node2.projektzentrisch.de
3hermes.clemenshermanns.eu
3mx0.d7031.de
3mx1.d7031.de
3mail.fuenfer.net
3mail.liesmeine.email
3mailfilter.route91.net
3hermine.thw-hermeskeil.de
3mail2.alanwest.com
3arrakeen.geekwu.org
3mail.medien-selber-machen.de
3rhuarc.aybara.org
3mail2.sheridanwest.com
3mail.mirtouf.fr
3mail.inchin.ch
3mx-01.blueshift.nl
3mail.esajokinen.net
3mail.mydanner.de
3smtp.lightnet.dev
3mail.rootonline.de
3chaos.ipv6.olympe.lurenzu.org
3mail.cotsworth.com
3mail.factotum.ovh
3mail.weiliangchang.com
3h28.mijn.host
3mail.fam-schuetzer.de
3mail.yellenge.nl
3estragon.turmann.net
3m41l3r.webfoersterei.de
3tau-ceti-center.theflyingbear.net
3hyperion.theflyingbear.net
3promethee.ipv6.olympe.lurenzu.org
3mail.metropolis.nexus
3prod-demo000.zivver.net
3mail.teqt.de
3mali.rattenkot.io
3berta.postkuh.de
3mail.smart-tux.de
3mail-02.own-mail.eu
3border.ab2b.ru
3eclipse.servonline.de
3mail.odwulf.net
3mail.little-brother.eu
3smtp.bezdeka.de
3smtp1.scheler.com
3vmail1.greenie.net
3post.keepiteasy.eu
3post.clemenshermanns.de
3emx.siagnet.de
3ionos.wcclan.net
3smtp2.scheler.com
2mx.scne.xyz
2mail.mischke.it
2ben.mdewendt.de
2arsenic.violacea.com
2martin.mdewendt.de
2tim.mdewendt.de
2theos.kyriasis.com
2server.mhnnet.de
2mail.laponders.com
2node1.muam.de
2node2.muam.de
2node1.mucn.de
2node2.mucn.de
2mail.h2o.moe
2mail2.myocastor.de
2lima.ahrain.net
2mail.ahrain.net
2almeli01.aneirin.net
2lb.aneirin.net
2venus.br-hq.net
2mail1.balgoo.com
2mail.chao5.net
2mail2.chao5.net
2carrot.debelio.net
2mail.nsb-software.de
2xenon.blue-neutrino.com
2mail.pfoteplus.de
2mail.plaggemeier.de
2mail.prauscher.de
2sheldon.prauscher.de
2ms211.pylex.de
2mx.liguros.net
2ewr01.mta.mxfabric.net
2mail.skriniar.de
2s8.webhost.company
2mail.systemuser.de
2mail.holler.contact
2mx.techthisout.de
2christophfink.com
2nro-apps-2.ripe.net
2mail.rootsland.net
2oniz.s-up.net
2mail.sajat.net
2mail2.sheridanwest.net
2mail.simtrami.net
2mail.vantriel-networks.de
2mail2.theflyingbear.net
2mail.vandoormalen.net
2smtp.virteck.net
2mx01.millharrow.com
2mx02.millharrow.com
2mail.zoopnet.de
2failmail.dev
2mail.ptv.cz
2mx.lecs.dev
2mail.dk.tajniak.cloud
2schmidl.dev
2srv1.estroh.com
2mail.meinefamilie.digital
2mx.fibianet.dk
2mail.primaudialrecords.com
2mit.visviva.dk
2enos.riigikogu.ee
2ns.riigikogu.ee
2mail.alohastitch.de
2albigro.eu
2mail.christophbock.eu
2smtp.digiware.nl
2mail.flox.eu
2mail.xgenie.co
2mail.bgdesign.de
2smtp.bgdesign.de
2smtp.boeren.de
2mail.bs0x539.de
2mail.jordanmlu.nl
2mail2.jordanmlu.nl
2mxe1.joris2k.nl
2mail.tuxlinux.eu
2gietl.com
2smtp01.mosdata.nl
2smtp02.mosdata.nl
2mail.cmouse.fi
2metso.hack.fi
2mx.glanetec.com
2jonaswitmer.ch
2100110.fr
2cedar-gateway.albertlarsan.fr
2mail.pleijster.nl
2smtp.dasuku.de
2mailman.dataharbour.de
2mail1.theyosh.nl
2mail2.theyosh.nl
2mail.funk.bz
2sv2.silival.com
2mx1.u-n.nl
2mail.sovichetra.com
2in2smtp.std-service.com
2mail.fortmail.de
2bloodsugar.stoeckl.online
2mail.alolise.org
2mx.42.net.eu.org
2mail.fessel.org
2pmg.koehlerweb.org
2mail.ludek.org
2zeus.ipv6.olympe.lurenzu.org
2zeus.olympe.lurenzu.org
2mail.post-x.org
2mx02.rechtundordnung.org
2mail.razor.ovh
2mail.hjallr.com
2mail.genano.de
2mail.grenz-bonn.de
2mail.tok3n.com
2mail.afk.pm
2mail.marques.pub
2mail.pasion.ro
2terraba.impulsahosting.com
2sif.ruetti13.ch
2knight.blue
2mx.atmediamail.com
2mail.inty.se
2mx.jgosmann.de
2mupp.mupps.se
2mx.jitsi-meet.de
2mail.kaamoscreations.com
2mail.joniw.de
2mail.kdv-fh-bayern.de
2serdica.jaggi.info
2mail1.kdv-fh-bayern.de
2smx001.mao.systems
2smx002.mao.systems
2mail2.kdv-fh-bayern.de
2duyan.tech
2mail.ednodarvo.io
2mailstore.ab-data.us
2mail.gryffyn.io
2mail.kump.io
1mail.boerskashandelsonderneming.nl
1mail.broodfondshofvantwente.nl
1mail.camerabeveiliging-profs.nl
1mail.cloudvoorsecurity.nl
1mail.contactdenoord.nl
1kirkman.corstiaanhol.nl
1mail.croatiangrapes.nl
1mail.croatianwineambassador.nl
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