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remote mail server authentication fail (cannot find login or plain auth method)

EddyMinet

I'm trying to configure mail server settings for notifications but I get the following errors :

"Authentication method mismatch. Please confirm the authentication method support for LOGIN or PLAIN on the mail server"

I check my mail server (MailEnable v9) and it DOES have LOGIN command :

220 ******** ESMTP MailEnable Service, Version: 9.03-- ready at 08/17/16 11:32:31
ehlo sophos.com
250-***** [*******], this server offers 5 extensions
250-AUTH LOGIN
250-SIZE 30720000
250-HELP
250-AUTH=LOGIN
250 STARTTLS
QUIT
221 Service closing transmission channel

I have multiple customer sending to this mail server via authentication and never had this issue ...

I guess it could be an issue with the following line wich is send by mailenable and other mta to help legacy smtp client that have broken compatibility with new ESMTP RFC : "250-AUTH=LOGIN"



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  • 0

    Hi Eddy,

    Please try a different combination for Port number and Connection security. Please update if anything combination works. It's failing to authenticate with the Mail Server and we just need to learn where is the glitch.

    Thanks

    Sachin Gurung
    Team Lead | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  |  Video tutorials
    Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

    • 0 in reply to sachingurung

      Hi,

      I have tried all possible combinations of ports and security. I know exactly how to configure mail client for this specific mail server and I am pretty sure there is an issue with the interpretation of the EHLO response about the auth mechanisms capability of the server.

      • 0 in reply to EddyMinet

        Hi,

        Take SSH to XG and go to option 4. Device console.

        Execute, tcpdump 'port xxx (port number configured in the mail server notification settings in XG) post the logs.

        Thanks

        Sachin Gurung
        Team Lead | Sophos Technical Support
        Knowledge Base  |  @SophosSupport  |  Video tutorials
        Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

        • +1 in reply to sachingurung

          I solved the problem by allowing 'CRAM-MD5' authentication on my mail server. I never had any mail client requiering this option to be activated.