Re: [Fetchmail-users] ssl with dslextreme.com attempts to send a spurious email

[jdow <jd...@ds...>]

On 20190428 04:28:25, Ralph Corderoy wrote:
> Hi Joanne,
> 
>> These look suspicious in the first printout:
>> fetchmail: mail.dslextreme.com: WARNING: server offered STLS, but sslproto '' given.
> 
> Is there a reason you have «sslproto ''» somewhere?
> fetchmail(1) says
> 
>      To defeat opportunistic TLSv1 negotiation when the server advertises
>      STARTTLS or STLS, and use a cleartext connection use ''.

Actually I do not have sslproto in there anywhere and I never have. Should I put 
it in? And with what value? That is a good reason for some form of complaint to 
be issued.

I just tried "   sslproto auto" and "   sslproto auto   sslcertck" after the ssl 
and got an error line ten at auto. README.SSL is out of date?

Hm, I wonder if this is something baked into RedHat fetchmail.... I shall 
investigate this.

>> poll mail.dslextreme.com with proto pop3 port 995
>>       user 'jd...@ds...', with password 'xxxxx' ssl,
>>       is 'jdow@lllllll' here pass8bits
>> poll mail.dslextreme.com with proto pop3 port 995
>>       user 'YY...@ds...', with password 'yyyyyyy' ssl,
>>       is 'jdow@lllllll' here pass8bits
> ...
>> In the current configuration it looks like the YYYY ID was not polled, too.
> 
> I think it is, but it's lllllll not YYYY.

Um, yeah. It's a very little used ID and I forgot the real spelling when I went 
looking. I used it for setting up TeamViewer so I could help a blind very 
nontechnical friend with his computer. It seldom gets used these days. The state 
funded nursing assistant who helps him is adept enough now to handle it. He's 
80+ years old.

>> fetchmail: mail.dslextreme.com: WARNING: server offered STLS, but sslproto '' given.
>> fetchmail: POP3> USER jd...@ds...
>> fetchmail: POP3< +OK
>> fetchmail: POP3> PASS *
>> fetchmail: POP3< +OK server ready
> ...
>> fetchmail: mail.dslextreme.com: WARNING: server offered STLS, but sslproto '' given.
>> fetchmail: POP3> USER ll...@ds...
>> fetchmail: POP3< +OK
>> fetchmail: POP3> PASS *
>> fetchmail: POP3< +OK server ready
> 
> This look significant:
> 
>> Apr 27 13:57:32 thursday postfix/smtpd[30762]: connect from localhost[::1]
>> Apr 27 13:57:32 thursday postfix/smtpd[30762]: warning: Illegal address syntax
>>      from localhost[::1] in MAIL command:
>>      <JkiO@JkiO----------------------.us-west-2.compute.amazonaws.com>
>> Apr 27 13:57:32 thursday fetchmail[31459]: reading message
>>      jd...@ea...@pop.earthlink.net:1 of 1 (4706 octets) (log message incomplete)
>> Apr 27 13:57:32 thursday fetchmail[31459]: SMTP error: 501 5.1.7 Bad sender
>>      address syntax
>> Apr 27 13:57:32 thursday fetchmail[31459]: not flushed
> 
> The `log message incomplete' is confusing.  It doesn't mean it's logging
> that the message was incomplete, as in `reading message' used on the
> previous line.  It means `log-message incomplete': the routine to log
> one message was called whilst another hadn't been completed.

I believe that length might be the length of a message. I don't believe there is 
a message waiting on the dslextreme pop3 server. (It will do plain text logins 
and I checked in that mode.) I wonder if those octets contained the message that 
would have been sent.

> If fetchmail isn't flushing (deleting) the message then it's still on
> the server, ready to cause problems again.  Have you tried talking POP3
> manually?  Something like this should show the top 30 lines of email 1.
> 
>      telnet mail.dslextreme.com 995
>      USER ...
>      PASS ...
>      LIST
>      TOP 1 30
>      QUIT
> 
> Or is there a web-mail interface that lets one `view full headers',
> i.e. gets the web-mail interface out of the way.
> 

Worth a recheck. Nada.

$ telnet mail.dslextreme.com pop3
Trying 137.118.26.222...
Connected to mail.dslextreme.com.
Escape character is '^]'.
+OK POP3 ready
user ll...@ds...
+OK
pass .........
+OK server ready
list
+OK 0 messages
.
top 1 30
-ERR invalid message
quit
+OK nvl-mbs53.neonova.net Zimbra POP3 server closing connection
Connection closed by foreign host.
$ telnet mail.dslextreme.com pop3                             Trying 
137.118.26.222...
Connected to mail.dslextreme.com.
Escape character is '^]'.
+OK POP3 ready
user jd...@ds...
+OK
pass  .........
+OK server ready
list
+OK 0 messages
.
top 1 30
-ERR invalid message
quit
+OK nvl-mbs50.neonova.net Zimbra POP3 server closing connection
Connection closed by foreign host.


I think I shall download the source and try to make sense of it. Where might I 
find the sslproto "auto" option parsed? That seems like a REALLY good place to 
start looking. And I shall recompile it myself as a check. It might even be 
worth downloading the latest fetchmail so I can compare.

{^_^}