diff --git a/packages/fxa-auth-server/package.json b/packages/fxa-auth-server/package.json
index 19b2bb978e7..3aa08d76a8a 100644
--- a/packages/fxa-auth-server/package.json
+++ b/packages/fxa-auth-server/package.json
@@ -199,7 +199,7 @@
     "load-grunt-tasks": "^5.1.0",
     "lodash.chunk": "4.2.0",
     "lodash.pick": "4.4.0",
-    "mailparser": "0.6.1",
+    "mailparser": "3.6.9",
     "mjml-browser": "^4.14.1",
     "mocha": "^10.0.0",
     "moment": "^2.29.4",
diff --git a/yarn.lock b/yarn.lock
index 9967e62f051..a940671aa0c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -15730,6 +15730,16 @@ __metadata:
   languageName: node
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+"@selderee/plugin-htmlparser2@npm:^0.11.0":
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+  resolution: "@selderee/plugin-htmlparser2@npm:0.11.0"
+  dependencies:
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+    selderee: ^0.11.0
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+  languageName: node
+  linkType: hard
+
 "@sentry-internal/feedback@npm:7.100.1":
   version: 7.100.1
   resolution: "@sentry-internal/feedback@npm:7.100.1"
@@ -24391,13 +24401,6 @@ __metadata:
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 "adjust-sourcemap-loader@npm:^4.0.0":
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-"encoding@npm:*, encoding@npm:^0.1.11, encoding@npm:^0.1.12, encoding@npm:~0.1.7":
+"encoding-japanese@npm:2.0.0":
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+  resolution: "encoding-japanese@npm:2.0.0"
+  checksum: 6b1ee85e81d16bfbeb96b887239cef888859b071164c916088078f4db4c10f7b83e4042dfd804c68063ce50c129abd02c42ac1753e60ccd2705f4c103ec798f1
+  languageName: node
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   resolution: "encoding@npm:0.1.12"
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@@ -37305,7 +37315,7 @@ fsevents@~2.1.1:
     lodash.chunk: 4.2.0
     lodash.pick: 4.4.0
     luxon: ^2.5.2
-    mailparser: 0.6.1
+    mailparser: 3.6.9
     memcached: ^2.2.2
     mjml: ^4.13.0
     mjml-browser: ^4.14.1
@@ -40679,6 +40689,19 @@ fsevents@~2.1.1:
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   linkType: hard
 
+"html-to-text@npm:9.0.5":
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+  resolution: "html-to-text@npm:9.0.5"
+  dependencies:
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+    deepmerge: ^4.3.1
+    dom-serializer: ^2.0.0
+    htmlparser2: ^8.0.2
+    selderee: ^0.11.0
+  checksum: 205e0faa9b9aa281b369122acdffc5f348848e400f4037fde1fb12d68a6baa11644d2b64c3cc6821a79d3bc7316d89e85cc733d86f7f709858cb5c5b72faac65
+  languageName: node
+  linkType: hard
+
 "html-void-elements@npm:^2.0.0":
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   resolution: "html-void-elements@npm:2.0.1"
@@ -40791,6 +40814,18 @@ fsevents@~2.1.1:
   languageName: node
   linkType: hard
 
+"htmlparser2@npm:^8.0.2":
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+  resolution: "htmlparser2@npm:8.0.2"
+  dependencies:
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+    entities: ^4.4.0
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+  languageName: node
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+
 "http-browserify@npm:1.7.0":
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@@ -46452,6 +46487,13 @@ fsevents@~2.1.1:
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+"leac@npm:^0.6.0":
+  version: 0.6.0
+  resolution: "leac@npm:0.6.0"
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+  languageName: node
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@@ -46550,6 +46592,44 @@ fsevents@~2.1.1:
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+  dependencies:
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+  languageName: node
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+"libmime@npm:5.3.4":
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+  resolution: "libmime@npm:5.3.4"
+  dependencies:
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+  languageName: node
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+
 "libphonenumber-js@npm:^1.10.14":
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   resolution: "libphonenumber-js@npm:1.10.18"
@@ -46564,6 +46644,20 @@ fsevents@~2.1.1:
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+"libqp@npm:2.0.1":
+  version: 2.0.1
+  resolution: "libqp@npm:2.0.1"
+  checksum: 04e3d32a1b89588ea50f73da39366b64dd9183d5b1fad3ac65e69abfac1f99693325da8cf6368b37836102dc13a67a1b9b5eab768c3e99246defaf460db96d94
+  languageName: node
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+"libqp@npm:2.1.0":
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+  resolution: "libqp@npm:2.1.0"
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+  languageName: node
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+
 "libtap@npm:^1.4.0":
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   resolution: "libtap@npm:1.4.0"
@@ -46682,6 +46776,15 @@ fsevents@~2.1.1:
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+"linkify-it@npm:5.0.0":
+  version: 5.0.0
+  resolution: "linkify-it@npm:5.0.0"
+  dependencies:
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+  languageName: node
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+
 "lint-staged@npm:^15.2.0":
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   resolution: "lint-staged@npm:15.2.0"
@@ -47480,15 +47583,32 @@ fsevents@~2.1.1:
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-"mailparser@npm:0.6.1":
-  version: 0.6.1
-  resolution: "mailparser@npm:0.6.1"
+"mailparser@npm:3.6.9":
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+  resolution: "mailparser@npm:3.6.9"
   dependencies:
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-    mime: ^1.3.4
-    mimelib: ^0.2.19
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+    mailsplit: 5.4.0
+    nodemailer: 6.9.11
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+  resolution: "mailsplit@npm:5.4.0"
+  dependencies:
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-"mime@npm:1.6.0, mime@npm:^1.3.4, mime@npm:^1.4.1, mime@npm:^1.6.0":
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   bin:
@@ -48368,16 +48488,6 @@ fsevents@~2.1.1:
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-"mimelib@npm:^0.2.19":
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-  resolution: "mimelib@npm:0.2.19"
-  dependencies:
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@@ -50466,6 +50576,13 @@ fsevents@~2.1.1:
   languageName: node
   linkType: hard
 
+"nodemailer@npm:6.9.11":
+  version: 6.9.11
+  resolution: "nodemailer@npm:6.9.11"
+  checksum: 496741f440fb7e4077ce9604c8ccab05b91db23fbedc15deebcae0642e1ead6539a9c7e2ae9f6352821ebfdad7ab091fbb16b4f00bb226ef5418da6a74b180be
+  languageName: node
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+
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   resolution: "nodemailer@npm:6.9.9"
@@ -52031,6 +52148,16 @@ fsevents@~2.1.1:
   languageName: node
   linkType: hard
 
+"parseley@npm:^0.12.0":
+  version: 0.12.1
+  resolution: "parseley@npm:0.12.1"
+  dependencies:
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+    peberminta: ^0.9.0
+  checksum: 147760bce6c4a4f8c62af021a84ced262f078f60a1119e6891eba69567a953e06295ad2c70e5e89892ad1d4af0126f0856742d657a19a29ebf58422cf3bfd4f3
+  languageName: node
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+
 "parseurl@npm:~1.3.2, parseurl@npm:~1.3.3":
   version: 1.3.3
   resolution: "parseurl@npm:1.3.3"
@@ -52369,6 +52496,13 @@ fsevents@~2.1.1:
   languageName: node
   linkType: hard
 
+"peberminta@npm:^0.9.0":
+  version: 0.9.0
+  resolution: "peberminta@npm:0.9.0"
+  checksum: b983b68077269ca8a3327520a0a3f027fa930faa9fb3cb53bed1cb3847ebc0ed55db936d70b1745a756149911f5f450e898e87e25ab207f1b8b892bed48fb540
+  languageName: node
+  linkType: hard
+
 "peek-readable@npm:^5.0.0":
   version: 5.0.0
   resolution: "peek-readable@npm:5.0.0"
@@ -55123,6 +55257,13 @@ fsevents@~2.1.1:
   languageName: node
   linkType: hard
 
+"punycode@npm:2.3.1":
+  version: 2.3.1
+  resolution: "punycode@npm:2.3.1"
+  checksum: bb0a0ceedca4c3c57a9b981b90601579058903c62be23c5e8e843d2c2d4148a3ecf029d5133486fb0e1822b098ba8bba09e89d6b21742d02fa26bda6441a6fb2
+  languageName: node
+  linkType: hard
+
 "punycode@npm:2.x.x, punycode@npm:^2.3.0":
   version: 2.3.0
   resolution: "punycode@npm:2.3.0"
@@ -58248,6 +58389,15 @@ resolve@1.1.7:
   languageName: node
   linkType: hard
 
+"selderee@npm:^0.11.0":
+  version: 0.11.0
+  resolution: "selderee@npm:0.11.0"
+  dependencies:
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+  checksum: af8a68c1f4cde858152943b6fc9f2b7164c8fb1a1c9f01b44350dffd1f79783930d77a0ae33548a036816d17c8130eeb9d15f1db65c9262ca368ad3a0d750f66
+  languageName: node
+  linkType: hard
+
 "select-hose@npm:^2.0.0":
   version: 2.0.0
   resolution: "select-hose@npm:2.0.0"
@@ -62079,6 +62229,15 @@ resolve@1.1.7:
   languageName: node
   linkType: hard
 
+"tlds@npm:1.250.0":
+  version: 1.250.0
+  resolution: "tlds@npm:1.250.0"
+  bin:
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+  checksum: 559a6757445fa7655fec52d80f96698233a9ab47bd0fabe8ece05ba48b209e7c9b927c05a929f187c38b33aa0c3a02178cf5c1bcd219c81e02c108fe82e94d55
+  languageName: node
+  linkType: hard
+
 "tmp@npm:^0.0.33":
   version: 0.0.33
   resolution: "tmp@npm:0.0.33"
@@ -63097,6 +63256,13 @@ resolve@1.1.7:
   languageName: node
   linkType: hard
 
+"uc.micro@npm:^2.0.0":
+  version: 2.1.0
+  resolution: "uc.micro@npm:2.1.0"
+  checksum: 37197358242eb9afe367502d4638ac8c5838b78792ab218eafe48287b0ed28aaca268ec0392cc5729f6c90266744de32c06ae938549aee041fc93b0f9672d6b2
+  languageName: node
+  linkType: hard
+
 "uglify-js@npm:2.7.3":
   version: 2.7.3
   resolution: "uglify-js@npm:2.7.3"
@@ -63895,16 +64061,6 @@ resolve@1.1.7:
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-"uue@npm:^3.0.0":
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-  resolution: "uue@npm:3.1.2"
-  dependencies:
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-    extend: ~3.0.0
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-  languageName: node
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 "uuid-browser@npm:^3.1.0":
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   resolution: "uuid-browser@npm:3.1.0"