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issuer CAs that issued their current certificate and to pre-publish records for upcoming CAs if the current issuer is no longer active.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
19846mail.lima-city.de
11644mx1.simplelogin.co
11638mx2.simplelogin.co
10971mx1.vevida.com
10968mx2.vevida.com
10967mx3.vevida.com
10961mx4.vevida.com
10955backup-mx.vevida.com
1214h11.mijn.host
1133h19.mijn.host
1111h9.mijn.host
958h15.mijn.host
954h14.mijn.host
930h20.mijn.host
906h17.mijn.host
856h18.mijn.host
805h3-da.mijn.host
771h16.mijn.host
761h8.mijn.host
683h13.mijn.host
651h10.mijn.host
613h12.mijn.host
569mail.srvfarm.net
511h6-da.mijn.host
463h7.mijn.host
410h4-da.mijn.host
212email-anywhere.nl
163mx02.kdmails.de
163mx03.kdmails.de
163mx01.kdmails.de
115s1.webhost.company
109spm02.cloudvoor.nl
108spm01.cloudvoor.nl
67ecn3.ecn.cz
64h37.mijn.host
63ecn4.ecn.cz
62h40.mijn.host
62s12.webhost.company
60h44.mijn.host
59h34.mijn.host
56mail.netfuture.ch
55h43.mijn.host
53web1.sys.ccs-baumann.de
53web2.sys.ccs-baumann.de
51h39.mijn.host
50mx2.amsterdamtech.net
50mx1.amsterdamtech.net
47h58.mijn.host
47mail.ncsc.de
46h33.mijn.host
46h29.mijn.host
46h27.mijn.host
46s2.webhost.company
44h38.mijn.host
44frodo.akxnet.de
42s5.webhost.company
41h45.mijn.host
40mail.sciver.net
40s3.webhost.company
40mx2.webmeneer.net
40mx1.webmeneer.net
39h48.mijn.host
38merlin.cutisan.dk
37h57.mijn.host
37h35.mijn.host
36h60.mijn.host
36h30.mijn.host
36vps.greenbull.it
36mx2.vos-systems.net
36mx4.vos-systems.net
36s4.webhost.company
36mx3.vos-systems.net
35h55.mijn.host
34s13.webhost.company
33svr1.it-df.net
33svr2.it-df.net
33svr3.it-df.net
33svr4.it-df.net
32thoth.cutisan.net
31h47.mijn.host
31h36.mijn.host
31h50.mijn.host
30h41.mijn.host
30nc.hitco.at
29mx2.ernstberger.cloud
29h54.mijn.host
28h32.mijn.host
28mail12.imapserver.dk
27h59.mijn.host
26mx1.vos-systems.net
26h46.mijn.host
26h52.mijn.host
25smtp3.muehlberger.net
25s11.webhost.company
24h31.mijn.host
24mail.jedi-it.de
21h51.mijn.host
21in4smtp.std-service.com
20h49.mijn.host
20smtp.std-service.com
20mail.raksha.ch
20h42.mijn.host
20mx2.mchosted.nl
18mx-02.beastie.de
18mail.sysnull.net
18mail.gadecs.com
18h21.mijn.host
18mx-01.beastie.de
17mail2.jedi-it.de
17s6.webhost.company
17mx2.ha-vel.cz
16h53.mijn.host
16h61.mijn.host
16hosting03.spotler.net
16mx1.vereinshosting.ch
15s7.webhost.company
15mail.laesche.net
15d.mx.mb-net.net
15alt2.mail.leonklingele.de
15mail.sig-io.nl
15alt1.mail.leonklingele.de
15mail.leonklingele.de
15a.mx.mb-net.net
15artemis.strebsjig.net
15mx2.vereinshosting.ch
15bb-8.snakeoil.de
15c-3po.snakeoil.de
15alt4.mail.leonklingele.de
15r2-d2.snakeoil.de
15alt3.mail.leonklingele.de
15c.mx.mb-net.net
15b.mx.mb-net.net
14mail.ragnatela.com.br
14mail.laesche.eu
13mail.deady.space
12mail.twe.net
12mx-13.magellanic.eu
12mail.raven.express
12mx-5.magellanic.eu
11lotus.huppelrecords.nl
11s9.webhost.company
11mailv4.davizone.at
11mail.davizone.at
11h56.mijn.host
11h5-da.mijn.host
11mailv6.davizone.at
10mail.yzal.io
10mail.blep.cz
10huaxal.midgard-muenchen.de
10mail.sportvereine.online
10mx.masterdeb.de
10mxe1.detack.de
10mxe2.detack.de
10mail.profidea.cz
10mx.uppenbrink.net
10norica.jaggi.info
10mail.ideas-in-logic.de
10hg.net2service.com
9mx2.vforge.net
9emilia.zenti.cloud
9thylacine3.cfaerber.name
9mail.pr0.tech
9s10.webhost.company
9mail.intralan.nl
9mx2.tlshost.net
9mx1.vforge.net
9mx3.vforge.net
8mail.dohd.org
8mail.saftware.de
8mail.server-schwabe.de
8mail.neef-media.com
8amail.ha-vel.cz
8mx2.slxh.eu
8any.qu1x.one
8mail.chas.se
8mail.briefhansa.de
7mail.itspattison.de
7mail.swiss-link.net
7meow.host.mau.fi
7rx-0.ch-dk-2.simpoly.ch
7insblauehinein.nl
7rx-0.ch-gva-2.simpoly.ch
7syndace.email
7mail.dadosch.de
7mail.vpmsite.net
7mailbackup.d9ping.nl
7mx1.mailserver.ovh
6mail.efflam.net
6mx01.mindorf-online.de
6smtp.delaat.net
6mail.ffct.eu
6mail.matthiashille.com
6mx2.sys.ccs-baumann.de
6mail2.brain-offload.de
6ibio.nl
6mail.w4w.de
6mail.spookje.org
6mail.js86.de
6mail0.brain-offload.de
6mx2.privatemail.dk
6mx1.privatemail.dk
6smtp.koeroo.net
6scanner.alderneyconsoles.co.uk
6dev.koan19.net
6mail.evangineer.net
6box2.tolerantnetworks.com
5mailx.bhatia.eu
5mx1.ipmorris.net
5mx0.ipmorris.net
5mail.effectivemomentum.com
5postbox.idefix.net
5mailmib.hlrs-lamusse.net
5mx2.ftcz.net
5mx.ojaehrling.de
5mail.behindthemoon.net
5smtp.lightnet.dev
5smtp.maths.network
5mx1.nerdpol.org
5mail.lucalab.eu
5mail.leemankuiper.nl
5mail.kglobal.llc
5mta02.kleckerbox.link
5mta01.kleckerbox.link
5mail.mxgateway.eu
5mail.msk.pub
5smtp.meekorah.net
5mx1.darvo.nl
5mx2.darvo.nl
5mail.kestrel.institute
5mail.accolon.de
5mx1.urandom.ca
5w1.mijn.website
5s8.webhost.company
5mail.twwd.de
5pmg.ebbs.nl
5mail.tdlt.ch
4mail.geneberg.net
4smtp.hs-bund.de
4mx.coldlogic.io
4mail.kehlenbach.net
4mail.flox.org
4gate01.masgalor.de
4gorki.wkraft.org
4mail.lampenlurch.de
4mx1.riseup.net
4mail.seelentium.de
4mail.liesmeine.email
4mail.trivernis.net
4devold.4f.no
4mx.boxencrypt.com
4sternschnuppe.bofh-noc.de
4mail.rs-netzwerk.de
4promethee.olympe.lurenzu.org
4mail.lecody.com
4mail.records.sh
4mail.rkfomh.net
4mx2.urandom.ca
4mail.birdee.at
4mail.itzer.de
4useast.colincogle.name
4eu.colincogle.name
4de1.colincogle.name
4mail.petabits.de
4mail.yobagame.com
4mars.kerschersys.de
4chaos.olympe.lurenzu.org
4mail.abdene.dk
4gate02.masgalor.de
4mail.bitwrk.de
4smtp.s2net.ch
4mail.niclasjonsson.nu
4ampersand.cgx.me
3smtp1.scheler.com
3smtp2.scheler.com
3rhuarc.aybara.org
3vmail1.greenie.net
3estragon.turmann.net
3hermes.clemenshermanns.eu
3ionos.wcclan.net
3promethee.ipv6.olympe.lurenzu.org
3mail.rootonline.de
3node2.projektzentrisch.de
3chaos.ipv6.olympe.lurenzu.org
3mail.jtebruegge.de
3node1.projektzentrisch.de
3prod-demo000.zivver.net
3mail.odwulf.net
3mail.netfreax.de
3mail2.myocastor.de
3mail.metropolis.nexus
3mail.factotum.ovh
3mail.mirtouf.fr
3smtp.bezdeka.de
3mta.wasteland.co
3mx-01.blueshift.nl
3mx3.alotof.it
3mail.majah.de
3mail2.alanwest.com
3mx2.alotof.it
3border.ab2b.ru
3mail2.sheridanwest.com
3mali.rattenkot.io
3m41l3r.webfoersterei.de
3mail-02.own-mail.eu
3mail.binksma.de
3arrakeen.geekwu.org
3mx1.gtgmail.de
3mail.yellenge.nl
3tau-ceti-center.theflyingbear.net
3mail.smart-tux.de
3post.clemenshermanns.de
3mail.cotsworth.com
3mx1.ernstberger.cloud
3hyperion.theflyingbear.net
3mail.goik.de
3mx0.d7031.de
3mx1.d7031.de
3h28.mijn.host
3mail.fam-schuetzer.de
3mail.teqt.de
3mail.fuenfer.net
3hermine.thw-hermeskeil.de
3mail.inchin.ch
3mail.tincloud.de
3mail2.tincloud.de
2mail.ednodarvo.io
2mail2.theflyingbear.net
2arsenic.violacea.com
2mail.skriniar.de
2mail.weiliangchang.com
2mail.systemuser.de
2eipi1.tbahn.de
2femur.tbahn.de
2mail.wellnessbudget.com
2christophfink.com
2mx.techthisout.de
2mail.tempcup.de
2failmail.dev
2mail.holler.contact
2oniz.s-up.net
2mx01.millharrow.com
2sheldon.prauscher.de
2schmidl.dev
2mx02.millharrow.com
2mail.simtrami.net
2mail2.sheridanwest.net
2mail.prauscher.de
2mail.sajat.net
2mail.funk.bz
2mail.rootsland.net
2mx.fibianet.dk
2mail.plaggemeier.de
2mail.h5b.email
2albigro.eu
2nro-apps-2.ripe.net
2mail.christophbock.eu
2mail.flox.eu
2srv1.estroh.com
2mail.nsb-software.de
2post.keepiteasy.eu
2mail.dk.tajniak.cloud
2mail.little-brother.eu
2xenon.blue-neutrino.com
2mail.jordanmlu.nl
2mail2.jordanmlu.nl
2mxe1.joris2k.nl
2mxe1-4.joris2k.nl
2ewr01.mta.mxfabric.net
2node2.mucn.de
2mail.ptv.cz
2smtp01.mosdata.nl
2smtp02.mosdata.nl
2node1.mucn.de
2mail.sovichetra.com
2node2.muam.de
2mail.tuxlinux.eu
2node1.muam.de
2sif.ruetti13.ch
2mail.pleijster.nl
2mx.liguros.net
2mail.cmouse.fi
2server.mhnnet.de
2tim.mdewendt.de
2100110.fr
2cedar-gateway.albertlarsan.fr
2martin.mdewendt.de
2mail.laponders.com
2mail1.theyosh.nl
2mail2.theyosh.nl
2ben.mdewendt.de
2knight.blue
2mx1.u-n.nl
2mail.bgdesign.de
2smtp.bgdesign.de
2smtp.boeren.de
2serdica.jaggi.info
2bloodsugar.stoeckl.online
2mail.ls-srv.de
2mail.alolise.org
2theos.kyriasis.com
2terraba.impulsahosting.com
2mx.42.net.eu.org
2mail.fessel.org
2carrot.debelio.net
2mail.tok3n.com
2mail2.chao5.net
2mail.chao5.net
2venus.br-hq.net
2mail2.kdv-fh-bayern.de
2mail1.kdv-fh-bayern.de
2lb.aneirin.net
2zeus.ipv6.olympe.lurenzu.org
2zeus.olympe.lurenzu.org
2almeli01.aneirin.net
2mail.ahrain.net
2lima.ahrain.net
2mail.kdv-fh-bayern.de
2mail.h2o.moe
2mx02.rechtundordnung.org
2mail.joniw.de
2mail.kaamoscreations.com
2mx.jgosmann.de
2coruna.trasno.org
2ocean.trasno.org
2mail.razor.ovh
2mx.atmediamail.com
2mail.mischke.it
2mail.afk.pm
2h62.mijn.host
2mail.oddte.ch
2mail.pasion.ro
2mail.inty.se
2mx.scne.xyz
2mail.bs0x539.de
2mail.primaudialrecords.com
2mail.gryffyn.io
2mail.grenz-bonn.de
2smx001.mao.systems
2smx002.mao.systems
2mail.frykholm.com
2duyan.tech
2smtp.dasuku.de
2mail.datadorf.de
2mailman.dataharbour.de
2gietl.com
2in2smtp.std-service.com
2mail.genano.de
2mailstore.ab-data.us
2jonaswitmer.ch
2mail.hjallr.com
2smtp.virteck.net
2mail.vandoormalen.net
1mail.mrdavy.nl
1mymails.nl
1mail.narrowcastingbysmash.nl
1mail.netwerk-profs.nl
1mail.nijkit.nl
1mail.nnotw.nl
1mail.oetlul.nl
1mail.onuferova.nl
1mail.patrickkas.nl
1mail.poephoofd.nl
1poortvlietdelft.nl
1mail.router-profs.nl
1mail.rutger.nl
1mail.sbpg.nl
1mail.scpocahontas.nl
1mail.smash-cb.nl
1mail.smashcb.nl
1mail.spraycannon.nl
1mail.stofbeheersing.nl
1mail.the-mbgroup.nl
1mail.theyosh.nl
1mail3.theyosh.nl
1mail4.theyosh.nl
1mail.tswestendorp.nl
1mail.ubiquiti-profs.nl
1mail.unifi-profs.nl
1mail.wifi-profs.nl
1vps02.woudenbergh.nl
1mail.xs2net.nl
1email.itn.nu
1mailone.security.kiwi.nz
1mail.mingxu.one
1mx.sportvereine.online
1mx.stoeckl.online
1mx6.stoeckl.online
1smtp1.23ro.org
1mail.8623.org
1adblockextreme.org
1yuno.antopie.org
1mail1.apahlevan.org
1mail2.apahlevan.org
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