diff --git a/.github/workflows/build_test_deploy.yml b/.github/workflows/build_test_deploy.yml
index 5388018e..10c248d7 100644
--- a/.github/workflows/build_test_deploy.yml
+++ b/.github/workflows/build_test_deploy.yml
@@ -576,7 +576,9 @@ jobs:
           issue: "${{ steps.changelog.outputs.issue }}"
           changelog: "${{ steps.changelog.outputs.content }}"
         run: |
-            message="Changelog :mailbox:
+            EOT=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
+            cat << "${EOT}" >> release_note.md
+            Changelog :mailbox:
             ---------
             + ${{ env.changelog }}
 
@@ -589,7 +591,7 @@ jobs:
             The main version X.Y (e.g. 1.9) will always reflect the latest version of the branch. To update your Mailu installation simply pull the latest images \`docker compose pull && docker compose up -d\`.
 
             The pinned version X.Y.Z (e.g. 1.9.1) is not updated. It is pinned to the commit that was used for creating this release. You can use a pinned version to make sure your Mailu installation is not suddenly updated when recreating containers. The pinned version allows the user to manually update. It also allows to go back to a previous pinned version.
-            " && echo "$message" >> release_note.md
+            ${EOT}
       - name: Show release note
         shell: bash
         run: |
diff --git a/core/dovecot/conf/dovecot.conf b/core/dovecot/conf/dovecot.conf
index 15d6ed72..ebcd97aa 100644
--- a/core/dovecot/conf/dovecot.conf
+++ b/core/dovecot/conf/dovecot.conf
@@ -122,6 +122,13 @@ service imap-login {
   }
 }
 
+service pop3-login {
+  inet_listener pop3 {
+    port = 110
+    haproxy = yes
+  }
+}
+
 ###############
 # Delivery
 ###############
diff --git a/core/postfix/conf/master.cf b/core/postfix/conf/master.cf
index 86659460..f88a19b3 100644
--- a/core/postfix/conf/master.cf
+++ b/core/postfix/conf/master.cf
@@ -53,3 +53,6 @@ lmtp      unix  -       -       n       -       -       lmtp
 anvil     unix  -       -       n       -       1       anvil
 scache    unix  -       -       n       -       1       scache
 postlog   unix-dgram n  -       n       -       1       postlogd
+
+{# Ensure that the rendered file ends with a newline #}
+{{- "\n" }}
diff --git a/tests/compose/core/05_connectivity.py b/tests/compose/core/05_connectivity.py
new file mode 100755
index 00000000..480dca46
--- /dev/null
+++ b/tests/compose/core/05_connectivity.py
@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+
+import imaplib
+import poplib
+import smtplib
+import os
+
+SERVER='localhost'
+USERNAME='user@mailu.io'
+PASSWORD='password'
+
+def test_imap(server, username, password):
+    print(f'Authenticating to imaps://{username}:{password}@{server}:993/')
+    with imaplib.IMAP4_SSL(server) as conn:
+        conn.login(username, password)
+        conn.noop()
+    print('OK')
+    print(f'Authenticating to imaps://{username}:{password}@{server}:143/')
+    with imaplib.IMAP4(server) as conn:
+        conn.starttls()
+        conn.login(username, password)
+        conn.noop()
+    print('OK')
+    print(f'Authenticating to imap://{username}:{password}@{server}:143/')
+    try:
+        with imaplib.IMAP4(server) as conn:
+            conn.login(username, password)
+        print(f'Authenticating to imap://{username}:{password}@{server}:143/ worked without STARTTLS!')
+        os.exit(102)
+    except imaplib.IMAP4.error:
+        print('NOK - expected')
+
+def test_pop3(server, username, password):
+    print(f'Authenticating to pop3s://{username}:{password}@{server}:995/')
+    conn = poplib.POP3_SSL(server)
+    conn.capa()
+    conn.user(username)
+    conn.pass_(password)
+    conn.close()
+    print('OK')
+    print(f'Authenticating to pop3s://{username}:{password}@{server}:110/')
+    conn = poplib.POP3(server)
+    conn.stls()
+    conn.capa()
+    conn.user(username)
+    conn.pass_(password)
+    conn.close()
+    print('OK')
+    print(f'Authenticating to pop3://{username}:{password}@{server}:110/')
+    try:
+        conn = poplib.POP3(server)
+        conn.capa()
+        conn.user(username)
+        conn.pass_(password)
+        conn.close()
+        print(f'Authenticating to pop3://{username}:{password}@{server}:110/ worked without STARTTLS!')
+        os.exit(103)
+    except poplib.error_proto:
+        print('NOK - expected')
+
+def test_SMTP(server, username, password):
+    print(f'Authenticating to smtps://{username}:{password}@{server}:465/')
+    with smtplib.SMTP_SSL(server) as conn:
+        conn.ehlo()
+        conn.login(username, password)
+        print('OK')
+    print(f'Authenticating to smtps://{username}:{password}@{server}:587/')
+    with smtplib.SMTP(server, 587) as conn:
+        conn.ehlo()
+        conn.starttls()
+        conn.ehlo()
+        conn.login(username, password)
+        print('OK')
+    try:
+        print(f'Authenticating to smtp://{username}:{password}@{server}:587/')
+        with smtplib.SMTP(server, 587) as conn:
+            conn.ehlo()
+            conn.login(username, password)
+            print(f'Authenticating to smtp://{username}:{password}@{server}:587/ worked!')
+            os.exit(104)
+    except smtplib.SMTPNotSupportedError:
+        print('NOK - expected')
+    #port 25 should fail
+    try:
+        print(f'Authenticating to smtps://{username}:{password}@{server}:25/')
+        with smtplib.SMTP(server) as conn:
+            conn.ehlo()
+            conn.starttls()
+            conn.ehlo()
+            conn.login(username, password)
+            print(f'Authenticating to smtps://{username}:{password}@{server}:25/ worked!')
+            os.exit(105)
+    except smtplib.SMTPNotSupportedError:
+        print('NOK - expected')
+    try:
+        print(f'Authenticating to smtp://{username}:{password}@{server}:25/')
+        with smtplib.SMTP(server) as conn:
+            conn.ehlo()
+            conn.login(username, password)
+            print(f'Authenticating to smtp://{username}:{password}@{server}:25/ worked without STARTTLS!')
+            os.exit(106)
+    except smtplib.SMTPNotSupportedError:
+        print('NOK - expected')
+
+if __name__ == '__main__':
+    test_imap(SERVER, USERNAME, PASSWORD)
+    test_pop3(SERVER, USERNAME, PASSWORD)
+    test_SMTP(SERVER, USERNAME, PASSWORD)
diff --git a/towncrier/newsfragments/2756.bugfix b/towncrier/newsfragments/2756.bugfix
new file mode 100644
index 00000000..1eee6f41
--- /dev/null
+++ b/towncrier/newsfragments/2756.bugfix
@@ -0,0 +1 @@
+Fix a bug preventing POP3 from being usable