diff --git a/mail4one/pop3.py b/mail4one/pop3.py
index d3de548..9600de8 100644
--- a/mail4one/pop3.py
+++ b/mail4one/pop3.py
@@ -219,10 +219,10 @@ def trans_command_retr(mails: MailList, req: Request) -> None:
         write(ok("Contents follow"))
         with get_mail_fp(entry) as fp:
             for line in fp:
-                if line[0] == b'.':
-                    write(b'.')
+                if line.startswith(b'.'):
+                    write(b'.') # prepend dot
                 write(line)
-        # write(get_mail(entry))
+        # write(get_mail(entry)) # no prepend dot
         write(end())
         mails.delete(req.arg1)
     else:
@@ -391,13 +391,14 @@ def debug_main():
     logging.basicConfig(level=logging.DEBUG)
 
     import sys
+    from .pwhash import gen_pwhash
 
-    _, mails_path, port, password = sys.argv
+    _, mails_path, mbox = sys.argv
 
     mails_path = Path(mails_path)
-    port = int(port)
+    users = [ User(username="dummy", password_hash=gen_pwhash("dummy"), mbox=mbox) ]
 
-    asyncio.run(a_main(mails_path, port, password_hash=password_hash))
+    asyncio.run(a_main("127.0.0.1", 1101,  mails_path, users=users))
 
 
 if __name__ == "__main__":
diff --git a/tests/test_pop.py b/tests/test_pop.py
index b17dfd1..f5def85 100644
--- a/tests/test_pop.py
+++ b/tests/test_pop.py
@@ -4,18 +4,17 @@ import logging
 import tempfile
 import time
 import os
+import poplib
 from mail4one.pop3 import create_pop_server
 from mail4one.config import User
 from pathlib import Path
 
 TEST_HASH = "".join(
-    c
-    for c in """
+    """
 AFTY5EVN7AX47ZL7UMH3BETYWFBTAV3XHR73CEFAJBPN2NIHPWD
 ZHV2UQSMSPHSQQ2A2BFQBNC77VL7F2UKATQNJZGYLCSU6C43UQD
 AQXWXSWNGAEPGIMG2F3QDKBXL3MRHY6K2BPID64ZR6LABLPVSF
-"""
-    if not c.isspace()
+""".split()
 )
 
 TEST_USER = "foobar"
@@ -48,7 +47,8 @@ Hello bro\r
 IlzVOJqu9Zp7twFAtzcV\r
 yQVk36B0mGU2gtWxXLr\r
 PeF0RtbI0mAuVPLQDHCi\r
-\r\n"""
+\r
+"""
 
 
 def setUpModule() -> None:
@@ -57,13 +57,21 @@ def setUpModule() -> None:
     td = tempfile.TemporaryDirectory(prefix="m41.pop.")
     unittest.addModuleCleanup(td.cleanup)
     MAILS_PATH = Path(td.name)
-    os.mkdir(MAILS_PATH / TEST_MBOX)
-    for md in ("new", "cur", "tmp"):
-        os.mkdir(MAILS_PATH / TEST_MBOX / md)
+    for mbox in (TEST_MBOX, TEST_MBOX2):
+        os.mkdir(MAILS_PATH / mbox)
+        for md in ("new", "cur", "tmp"):
+            os.mkdir(MAILS_PATH / mbox / md)
     with open(MAILS_PATH / TEST_MBOX / "new/msg1.eml", "wb") as f:
         f.write(TESTMAIL)
     with open(MAILS_PATH / TEST_MBOX / "new/msg2.eml", "wb") as f:
         f.write(TESTMAIL)
+    with open(MAILS_PATH / TEST_MBOX2 / "new/msg1.eml", "wb") as f:
+        f.write(TESTMAIL)
+        f.write(b"More lines to follow\r\n")
+        f.write(b".Line starts with a dot\r\n")
+        f.write(b"some more lines\r\n")
+        f.write(b".\r\n")
+        f.write(b"Previous line just has a dot\r\n")
     logging.debug(MAILS_PATH)
 
 
@@ -205,6 +213,21 @@ class TestPop3(unittest.IsolatedAsyncioTestCase):
         """
         await self.dialog_checker(dialog)
 
+    async def test_poplib(self) -> None:
+        def run_poplib():
+            pc = poplib.POP3("127.0.0.1", 7995)
+            try:
+                self.assertEqual(b"+OK Server Ready", pc.getwelcome())
+                self.assertEqual(b'+OK Welcome', pc.user("foo2"))
+                self.assertEqual(b'+OK Login successful', pc.pass_("helloworld"))
+                _, eml, oc = pc.retr(1)
+                self.assertIn(b"Previous line just has a dot", eml)
+                self.assertIn(b".Line starts with a dot", eml)
+                self.assertIn(b".", eml)
+            finally:
+                pc.quit()
+        await asyncio.to_thread(run_poplib)
+
     async def asyncTearDown(self) -> None:
         logging.debug("at teardown")
         self.writer.close()