Best Way To Troubleshoot Postfix Protocol Errors

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    Hopefully this tutorial will help you if you run into a Postfix protocol error. translates to different fourth IP addresses. They each respond to SMTP, but they are structured differently. Without knowing which of the 4 connections you connected to when needed, it’s hard to literally tell why it failed. But I have to walk your session through a step-by-step process and explain a few bugs that were discovered by the customer in the process. Postfix 

    postfix protocol error host

    This esmtp represents the status message of the server component as indicated by - . The last line of the status will definitely have in its place. Starting at 3, 4 SMTP servers respond with a 2-line status message with a two-line delay between corresponding sessions. The buyer may have to read the level message until they fully see the product.


    At this point, the patient breaks protocol by sending another command before returning to normal.


    Here the server breaks the protocol by sending a promo code with a different status, which the responder corresponding to Artandartam will interpret as a continuation of my 220- status line above.

      MAIL FROM:  

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  • Here, the client breaks standard extra-whitespace protocol with : and <. A place in this place is not allowed at all, although due to this there are mail servers that ignore this place and financially allow you to continue.

      250 2.1.0 GoodRCPT TO:  

    Here, the client is breaking protocol again, as is the entire MAIL command.

      550 5.5.1 Protocol error 

    postfix protocol error host

    It is true that an incredible protocol error has occurred. It is difficult to say what consequences of the protocol the mentioned errors are complaining that go beyond its scope. The RCPT command itself is incorrect, however there are no errors relative to each other that were not noticed earlier in the procedure.

      EXIT550 5.5.1 Protocol error 

    At the moment it is difficult to imagine from which side the link was closed. And since both sides dishonored the protocol, it probably doesn't matter much. We can't even tell which safe status codes are applicable.and what commands.

    After creating a mail server according to Postfix 3.1, messages from some recipient servers are returned with a protocol error: host mail.example said: 250 2.1.5 Recipient OK (as a DATA response to a positive order).

      mail postfix / smtp [30149]: <: 220 All potential clients and IP addresses to register. mail postfix / smtp [30149]:> in EHLO * mail postfix / smtp [30149]: <, All 220 IP traffic and logging. Postfix / smtp mail [30149]: Server functions: 0x1001 diameter 0 postfix / smtp [30149]: smtp_stream_setup: maxtime = 300 post enable_deadline = 0 postfix / smtp [30149]:>: MAIL FROM: < mail postfix / smtp [30149]: smtp_stream_setup: maxtime = 300 packets enable_deadline = 0 postfix / smtp [30149]: <: 250-mail. suffix / smtp [30149]: mail <: 250-ETRN postfix / smtp [30149]: email <: 250-AUTH LOGIN PLAIN postfix / smtp [30149]: mail <: 250-ENHANCEDSTATUSCODES postfix / smtp [30149]: mail <: 250-STARTTLS postfix / smtp [30149]: Pin <: 250 SIZE 25600000 postfix / smtp [30149]: postal>: RCPT TO: <> postfix / smtp [30149]: mail smtp_stream_setup: maxtime = 300 enable_deadline = 0 postfix / smtp [30149]: all <: 250 2.1.0 Sender OK postfix / smtp [30149]: mail>: DATA postfix / smtp [30149]: mail smtp_stream_setup: maxtime = 120 enable_deadline = 0 postfix / smtp [30149]: delivery <: 250 2.1.5 P  the emitter is ok 937715404F9: Relay =, to = , delay = 0.62, delay = 0.03 / 0.01 / 0.18 / 0.4, dsn = 5 ,5. Status = bounce 0, (protocol error: Host bounce [ip] noted: 250 2.1.5 Receiver OK (in DATA permission when ordering)) Mail-Postfix / smtp [30149]:> * RSET postfix / smtp [30149]: smtp_stream_setup: maxtime = 20 enable_deadline = 0 mail postfix / smtp [30149]: <= 354 Please fill in the details in  .   mail postfix / smtp [30149]:>: EXIT  

    Judging by the MAIL FROM, RCPT TO and Will protocols, the data will be transferred, but due to the confusion in the server words, we have the following requirements -
    Reply received by MAIL FROM 250 mail .. sell by lists
    to receive RCPT at 210 2.1.0 Sender OK (not OK)
    for DATA instead of 354 expected 260 2.1.5 Received OK of recipient
    After that, my SMTP client ends the meeting thinking something went wrong. Server side admin who reported that consumers received no choice mail, that is, they did not receive FROM MAIL.

    I tried unsuccessfully to shut down the PIPE. If you try to telnet the problem hosts, the submission will work fine - that is, the problem is still on my side.
    The question itself is possibleIs it possible that the site usually hangs somehow while processing the server responses with the suffix, so that the MAIL FROM is sent when only an EHLO-specific 250 response is received? Or is there a more wonderful solution?

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