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sosdg
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« on: July 27, 2009, 01:07:14 am » |
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Hello all, Apparently, the mail server used to test out certification for an ipv6 enabled e-mail address doesn't follow RFC standards when sending mail, and gets rejected by my server: 2009-07-27 01:55:50 SMTP protocol synchronization error (next input sent too soon: pipelining was
advertised): rejected "DATA" H=ipv6.he.net [2001:470:0:64::2] next input="To: \r\nFrom: ipv6@he.net\r
\nMessage-ID: <4a6d5d86d0209.1248681350@ipv6.he.net>\r\nSubject: IPv6 Certification Mail Test\r
\n\r\nPlease insert the following code" Basically, our mail server located at 2001:470:e867::2 uses a simple way of breaking alot spambots - it inserts a 2 second delay before showing the first '220-' line. This won't break RFC compliant mail servers, but will break mail servers (mostly spam bots) that dump out the entire conversation without bothering to check to see if its okay to do so yet. Unfortunately, it seems to affect the HE ipv6 testing mail server as well. Any way this could get fixed?  Brielle |
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dataless
Newbie
Posts: 26
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« Reply #1 on: July 27, 2009, 09:58:26 am » |
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Interesting..
I also filter pipelining and I did not encounter this problem with them.
Postfix (which I use) handles it differently than Sendmail though.
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sosdg
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« Reply #2 on: July 27, 2009, 01:10:23 pm » |
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I believe its the initial delay thats causing the problem. I'm going to have to sniff packets later on to get the exact idea on whats happening, but from observation, it looks like its either not waiting for the final '220' (without the - at the end) before sending the initial EHLO/HELO then pipelining, or its trying to pipeline without telling my end to pipeline.
I think its the former rather then latter personally. I've seen Exchange servers do the exact same thing in the past.
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kcochran
Sr. Network Engineer, Hurricane Electric
Administrator
Sr. Member
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« Reply #3 on: July 27, 2009, 02:48:28 pm » |
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It's actually not a mailserver, but the certification script you're interfacing with that's sending the mail.
We wait for data back from the server before sending the next line, and ensure we see a valid status number before moving on. The one thing I do see that probably tripped up our script on your server is the very long banner and command delays likely got what we were sending out of sync from what you were expecting. I've made some changes and it should be smarter.
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sosdg
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« Reply #4 on: July 27, 2009, 03:51:04 pm » |
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It's actually not a mailserver, but the certification script you're interfacing with that's sending the mail.
We wait for data back from the server before sending the next line, and ensure we see a valid status number before moving on. The one thing I do see that probably tripped up our script on your server is the very long banner and command delays likely got what we were sending out of sync from what you were expecting. I've made some changes and it should be smarter.
Cool. Thanks for checking this out! Brielle |
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sosdg
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« Reply #5 on: July 27, 2009, 03:53:17 pm » |
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I spoke too soon - getting the following error:
"Didn't get expected welcome"
From the test now.
Brielle
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kcochran
Sr. Network Engineer, Hurricane Electric
Administrator
Sr. Member
Posts: 261
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« Reply #6 on: July 27, 2009, 04:01:17 pm » |
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Blargh, the code really didn't handle multi-line banners well. This time for sure!
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jimb
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« Reply #7 on: July 27, 2009, 04:18:20 pm » |
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What's it written in BTW, Perl?
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sosdg
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« Reply #8 on: July 27, 2009, 04:23:52 pm » |
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Blargh, the code really didn't handle multi-line banners well. This time for sure!
No '220 ' found in welcome banner  I didn't realize my mail server could be this troublesome. heh. Brielle |
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kcochran
Sr. Network Engineer, Hurricane Electric
Administrator
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« Reply #9 on: July 27, 2009, 04:42:53 pm » |
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It's in PHP.
I this doesn't do it, I'm going to beat up a penguin. A small foam one, mind you, but a penguin nonetheless.
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sosdg
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« Reply #10 on: July 27, 2009, 08:12:52 pm » |
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It's in PHP.
I this doesn't do it, I'm going to beat up a penguin. A small foam one, mind you, but a penguin nonetheless.
Worked! Awesome! Thank you Brielle |
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kcochran
Sr. Network Engineer, Hurricane Electric
Administrator
Sr. Member
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« Reply #11 on: July 27, 2009, 09:47:22 pm » |
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Glad to hear that.
Penguin, you get a reprieve.
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tclement
Newbie
Posts: 8
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« Reply #12 on: November 05, 2010, 07:38:27 pm » |
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I'm also getting the error
Didn't get expected welcome
error message
My domain is theclements.info
thanks
Tim
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tclement
Newbie
Posts: 8
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« Reply #13 on: November 06, 2010, 06:49:33 am » |
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I figured out the problem on my end.
the hmailserver requires a new "ip range" for it to accept connections from ipv6
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snarked
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« Reply #14 on: November 06, 2010, 03:11:34 pm » |
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RE - Reply #9: Oh, No! Not a penguin, let alone "Tux." Anyone want to start a "save the penguin" fund here?  Save the penguin, save the world! The penguin must survive. |
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