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From: Thomas POINDESSOUS on 9 Jul 2010 09:44

Hi,


I have a problem between one of my postfix and a zimbra server (postfix server).


sometime (one mail every three days), I got this error :
502 5.5.2 Error: command not recognized (in reply to RCPT TO command)


I did a tcpdump to understand why I got this error and I found that one of the "RCPT TO:" command is cut in two packets.
First packet finished by "RC" and second packet began by "PT TO:". And the server doesn't understand this command.


Here is a part of the tcpdump (ascii is obfuscated but hexdump is not) :



0x0aa0: 6961 2e66 720d 0a52 4350 5420 544f 3a3c ia.fr..RCPT.TO:<
0x0ab0: 6e61 7335 3135 4066 6f6e 6369 612e 7072 nas515(a)XXXX.pr
0x0ac0: 6f3e 204f 5243 5054 3d72 6663 3832 323b o>.ORCPT=rfc822;
0x0ad0: 6e61 7335 3135 4066 6f6e 6369 612e 6672 nas515(a)XXXX.fr
0x0ae0: 0d0a 5243 ..RC
09:51:39.813192 IP xxxxxx.39555 > xxxxxx.smtp: P 2756:3667(911) ack 220 win 54 <nop,nop,timestamp 537283022 2175571428>
0x0000: 4500 03c3 43cc 4000 4006 6241 ac10 3706 E...C.@.@.bA..7.
0x0010: ac10 0201 9a83 0019 7b0e 14cf e256 415b ........{....VA[
0x0020: 8018 0036 8ff0 0000 0101 080a 2006 49ce ...6..........I.
0x0030: 81ac 95e4 5054 2054 4f3a 3c6e 6f65 6c6c ....PT.TO:<noell
0x0040: 652e 6d6f 6e74 6573 4066 6f6e 6369 612e e.montes(a)xxxx.
0x0050: 7072 6f3e 204f 5243 5054 3d72 6663 3832 pro>.ORCPT=rfc82


How can I solve this problem ?


Thanks in advance.



--
Thomas Poindessous

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