diff --git a/pkgs/development/python-modules/deltachat/default.nix b/pkgs/development/python-modules/deltachat/default.nix
index ffa9b8d7d63a..78f42bdfceb0 100644
--- a/pkgs/development/python-modules/deltachat/default.nix
+++ b/pkgs/development/python-modules/deltachat/default.nix
@@ -5,7 +5,7 @@
 , setuptools-scm
 , libdeltachat
 , cffi
-, IMAPClient
+, imapclient
 , pluggy
 , requests
 , setuptools
@@ -31,7 +31,7 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     cffi
-    IMAPClient
+    imapclient
     pluggy
     requests
     setuptools
diff --git a/pkgs/development/python-modules/imapclient/default.nix b/pkgs/development/python-modules/imapclient/default.nix
index ea4f388b6c7e..c1394a7b6b53 100644
--- a/pkgs/development/python-modules/imapclient/default.nix
+++ b/pkgs/development/python-modules/imapclient/default.nix
@@ -7,7 +7,7 @@
 }:
 
 buildPythonPackage rec {
-  pname = "IMAPClient";
+  pname = "imapclient";
   version = "2.2.0";
 
   src = fetchFromGitHub {
diff --git a/pkgs/development/python-modules/mailsuite/default.nix b/pkgs/development/python-modules/mailsuite/default.nix
index 23167af45b0e..8d1046387ef0 100644
--- a/pkgs/development/python-modules/mailsuite/default.nix
+++ b/pkgs/development/python-modules/mailsuite/default.nix
@@ -7,7 +7,7 @@
 , dnspython
 , html2text
 , mail-parser
-, IMAPClient
+, imapclient
 }:
 
 buildPythonPackage rec {
@@ -25,7 +25,7 @@ buildPythonPackage rec {
     dnspython
     html2text
     mail-parser
-    IMAPClient
+    imapclient
   ];
 
   pythonImportsCheck = [ "mailsuite" ];
diff --git a/pkgs/development/python-modules/parsedmarc/default.nix b/pkgs/development/python-modules/parsedmarc/default.nix
index b9fb35016c3b..7cba1c227a85 100644
--- a/pkgs/development/python-modules/parsedmarc/default.nix
+++ b/pkgs/development/python-modules/parsedmarc/default.nix
@@ -14,7 +14,7 @@
 , publicsuffix2
 , xmltodict
 , geoip2
-, IMAPClient
+, imapclient
 , dateparser
 , elasticsearch-dsl
 , kafka-python
@@ -49,7 +49,7 @@ buildPythonPackage rec {
     publicsuffix2
     xmltodict
     geoip2
-    IMAPClient
+    imapclient
     dateparser
     elasticsearch-dsl
     kafka-python
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index c6dca5addf99..43d8c3ef8a95 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -53,6 +53,7 @@ mapAliases ({
   googleapis_common_protos = googleapis-common-protos; # added 2021-03-19
   grpc_google_iam_v1 = grpc-google-iam-v1; # added 2021-08-21
   HAP-python = hap-python; # added 2021-06-01
+  IMAPClient = imapclient; # added 2021-10-28
   jupyter_client = jupyter-client; # added 2021-10-15
   lammps-cython = throw "no longer builds and is unmaintained";
   MechanicalSoup = mechanicalsoup; # added 2021-06-01
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 5ad54e7893d1..b25cc0339c4a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3666,7 +3666,7 @@ in {
 
   imantics = callPackage ../development/python-modules/imantics { };
 
-  IMAPClient = callPackage ../development/python-modules/imapclient { };
+  imapclient = callPackage ../development/python-modules/imapclient { };
 
   imaplib2 = callPackage ../development/python-modules/imaplib2 { };