On Mon, 16 Apr 2007, Mihai Dobre wrote:

> Hi list !
> 
> I have some users complaining for their lost e-mails. While searching for 
> problem in XMail log files I've found nothing strange except some "RCPT=OK" 
> with no RECV at all for several messages. Because not to get killed I went 
> further and I've found interesting things while sniffing the external 
> interface:
> ----
> T 81.181.166.135:41015 -> 212.146.110.52:25 [A]  
> GFQAARxUAAEgV..AABJFQAAXRUAAF4VAABuFQAA/OnTvq2frZ+tn62fjp+OfY5vXk9Anw
> AAAAAA..AAAAAAAAAAAAHRZoHXHbADUIgUNKEgBPSgMAUUoDAF5KAwBhShIAHRZo
> Ej8Y..ADUIgUNKEgBPSgMAUUoDAF5KAwBhShIAIBVoaG
> NEABZoaGNEAENKEgBPSgMA..UUoDAF5KAwBhShIAABoW
> #
> T 212.146.110.52:25 -> 81.181.166.135:41015 [A]
> 500 Syntax error, command unrecognized..500 Syntax error, command 
> unrecognized..500 Syntax error, command unrecognized..500 Syntax error, 
> command unrecognized..
> 
> T 194.176.176.10:2568 -> 212.146.110.52:25 [AP]
> lxosj5O7nWbJEfjjU3M1MrOOYr0qiQr1aiFVqyFRyrS..
> hAQtSlj7AWAiIx7Ij75r+EekBeRcjFXDa/qqGZ+1eeE4rUsLHtl2KYY1rcxBmdFkCAR8IyAaoxYt..
> gCxbAKCAwOOYDAh3ghIZiRKJ2mJ3jzdp7Yn0xwzRbu5pXVLbWV0Wyfkcbk9+vmNMc3oBZkU5DFB3..
> R5TagZa8p28xqHrByHrNLlMGDW1TBkGLYBbwQGMyJDPZMTMTxe8E+UaZUhCxnPB7ceUlNnAmwmX8..
> ##
> T 212.146.110.52:25 -> 194.176.176.10:2568 [A]
> 500 Syntax error, command unrecognized..500 Syntax error, command 
> unrecognized..500 Syntax error, command unrecognized..500 Syntax error, 
> command unrecognized..500 Syntax error,command unrecognized..500 Syntax 
> error, command unrecognized..
> ----
> The only change that I've made to the system (Xmail 1.24, Slackware 11.0, 
> kernel 2.6.20) is tc with ingress qdisc so I decided to pfifo_fast back and 
> the problem just disappeared, I've got happy users now and I'm still alive :)
> 1. Should XMail logs this kind of error at SMTP level with ESYNTAX ?
> 2. Does anyone experiencing XMail and qdisc ?   

Never used qdisc, but it is clear that it put itself in the middle and 
broke the command sequence.



- Davide


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