http://www.ritlabs.com New posts in The Bat Gmail error: SessionUnknownContentType ct (50) of forum at www.ritlabs.com [www.ritlabs.com] en http://backend.userland.com/rss2 Sat, 25 Oct 2025 00:37:13 +0300 The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.

====quote====
Alex wrote:
Same problem in October, 2025. Switching to 465 port helps
=============
I configured GMail on TB for the first time a year or two ago. IMAP, OAUTH, and from what I remember ports were configured automatically. I'm having no problems whatsoever. Port 465 is used, so that's the way to go.
25 October 2025 00:37:13, Miloš Radovanović.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message58262/ http://www.ritlabs.com/en/forums/forum4/topic4918/message58262/ Sat, 25 Oct 2025 00:37:13 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
Same problem in October, 2025. Switching to 465 port helps
24 October 2025 00:00:33, Alex.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message58258/ http://www.ritlabs.com/en/forums/forum4/topic4918/message58258/ Fri, 24 Oct 2025 00:00:33 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
I have same error while testing my SMTP-server based on exim. Using The Bat! 4.0.34:
The logs of The Bat!:
TLS Protocol error: Unexpected message SessionUnknownContentType ct (53)
The logs of exim:
SMTP protocol synchronization error (input sent without waiting for greeting): rejected connection from H=[MY-IP-ADDRESS] input="\026\003\001"

During testing, I discovered that I get the same error when connecting to same port with telnet and send any command before getting the greeting form server:
"220 MY-HOST-NAME ESMTP Exim 4.69 CURRENT-DATE-AND-TIME"

So, it seems, The Bat! should wait for a greeting (while exim makes a dns-requests). In fact, The Bat! do waits, but no longer than 5 or 6 seconds, and after that sends a command
09 February 2009 13:36:33, Feathered Frog.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message26997/ http://www.ritlabs.com/en/forums/forum4/topic4918/message26997/ Mon, 09 Feb 2009 13:36:33 +0200 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
Hi,

last weekend I noticed that this error message disappeared. Gmail seems to have made a correction.

Lubos
08 September 2007 18:36:03, Lubomir Fedak.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message19368/ http://www.ritlabs.com/en/forums/forum4/topic4918/message19368/ Sat, 08 Sep 2007 18:36:03 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
I don't get any error with Gmail using port 465 and "secure to dedicated port."
23 August 2007 22:50:24, Benson W.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message19128/ http://www.ritlabs.com/en/forums/forum4/topic4918/message19128/ Thu, 23 Aug 2007 22:50:24 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
I think they should just check for the 221 condition and if they don't get it _and_ the server is gmail, just ignore it.

I have several emails in my gmail folder and I get the error message but the message is still in my Outbox. So I have no clue if it was sent our not.

This is really annoying and needs to be worked around because since I've only seen this problem on The Bat!, I don't think other email (Eudora, TB, MS Live Mail!, Pocomail) programs I've used with GMail (and which don't have this problem) don't have this problem at all.  
20 August 2007 15:31:07, John Doe.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message19045/ http://www.ritlabs.com/en/forums/forum4/topic4918/message19045/ Mon, 20 Aug 2007 15:31:07 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
Now that Maxim (one of the developers) knows about it, we can only hope that it's going to be fixed.
20 August 2007 13:13:44, Roelof Otten.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message19042/ http://www.ritlabs.com/en/forums/forum4/topic4918/message19042/ Mon, 20 Aug 2007 13:13:44 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
Is there really nothing we can do about it? Is it a bug of Gmail or The Bat? I haven't got any response from Gmail and the Gmail Groups conferences also haven't found any solution yet...

Lubos
20 August 2007 08:13:25, Lubomir Fedak.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message19035/ http://www.ritlabs.com/en/forums/forum4/topic4918/message19035/ Mon, 20 Aug 2007 08:13:25 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
I'm getting the same thing too


====quote====

!8/19/2007, 19:07:17: SEND  - TLS protocol error: Unexpected message SessionUnknownContentType ct (50).

=============

20 August 2007 02:09:57, John Doe.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message19026/ http://www.ritlabs.com/en/forums/forum4/topic4918/message19026/ Mon, 20 Aug 2007 02:09:57 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
I am afraid it is still reproducible.
11 August 2007 12:34:40, Lubomir Fedak.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18895/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18895/ Sat, 11 Aug 2007 12:34:40 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
If this problem still reproducible at your side?
06 August 2007 18:10:38, Maxim Masiutin.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18819/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18819/ Mon, 06 Aug 2007 18:10:38 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
No.
The problem is on the gmail side for not following the smtp protocol. The end of the smtp session needs to be negotiated properly according to the specs.
05 August 2007 23:18:51, Roelof Otten.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18802/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18802/ Sun, 05 Aug 2007 23:18:51 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.

====quote====
Roelof Otten writes:
I get the same.
After sending a message TB sends a 'QUIT' command to the server to signal the end of the SMTP session.
TB expects a '221' signal from the server and gmail doesn't send that.
Hence the error.
=============

Forgive my poor Englisch
I've got the same problem, the mail is send normaly, so is it possible to turn off that 221 request from TB?

Greats Henk
05 August 2007 19:34:39, Henk Bosman.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18797/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18797/ Sun, 05 Aug 2007 19:34:39 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
I get the same.
After sending a message TB sends a 'QUIT' command to the server to signal the end of the SMTP session.
TB expects a '221' signal from the server and gmail doesn't send that.
Hence the error.
03 August 2007 13:55:24, Roelof Otten.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18762/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18762/ Fri, 03 Aug 2007 13:55:24 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
Hello,

I am using version 3.99.03 and have the same problem. Would anyone know what to do about it?

--
Lubos  
03 August 2007 12:18:11, Lubomir Fedak.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18760/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18760/ Fri, 03 Aug 2007 12:18:11 +0300 The Bat! - Configuring the E-mail Client The Bat Gmail error: SessionUnknownContentType ct (50) in forum The Bat! - Configuring the E-mail Client.
Using The Bat 3.98.1 with Gmail, upon sending any e-mail, the following error is reported. NOTE: The email is always sent sucessfully, but this error is still reported:

TLS Protocol error: Unexpected message SessionUnknownContentType ct (50)

The settings I am using are:

smtp.gmail.com
Secure to Regular port (STARTTLS) Port 587

Perform SMTP Authenticaion: YES, using same username ans password as for mail retreval.

Require secure authentication: NO

Use POP before SMTP authentication: NO

Any ideas on why this error is reported?

Cheers
Joe
26 July 2007 15:11:06, Joe Bloggs.]]> http://www.ritlabs.com/en/forums/forum4/topic4918/message18683/ http://www.ritlabs.com/en/forums/forum4/topic4918/message18683/ Thu, 26 Jul 2007 15:11:06 +0300 The Bat! - Configuring the E-mail Client