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Office Outlook 2013

Discussion in 'E-mail Discussion' started by George Dobre, Apr 3, 2018.

  1. George Dobre

    George Dobre Registered

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    Hello,

    We are having some hard times configuring emails for Outlook 2013, specifically, we cannot send emails. Keep getting: System administrator: undeliverable with message body "503 valid RCPT command must precede DATA". I also noticed that emails are not being delivered from iPhones. Everything else is ok, I also tested Samsung S8+ which is working perfectly fine, along with webmail clients and Outlook 2016

    Our server is running WHM/cPanel v68.0.36 on CentOS 6.9 kvm with csf v12.01

    csf TCP_IN = 20,21,22,25,26,53,80,110,143,443,465,587,993,995,2077,2078,2079,2080,2082,2083,2086,2087,2095,2096,2256

    csf TCP_OUT = 20,21,22,25,26,37,43,53,80,110,113,443,465,587,873,993,995,2086,2087,2089,2703

    I also tried to move Exim on port 26 but at the moment i reverted back to 25.

    Please give me some pointers in debugging this issue.

    Thank you,
    George
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello George,

    Can you let us know which version of Windows you are using when reproducing the issue with Outlook?

    Thank you.
     
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  3. George Dobre

    George Dobre Registered

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    Windows 10 Pro x64
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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  5. George Dobre

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    After trying most of the solutions I just managed to stumble upon another error "None of the authentication methods supported by this client are supported by your server". When i've installed cfs I've also enabled SMTP restrictions, I thought that could be the issue so I disabled it but no joy
     
  6. George Dobre

    George Dobre Registered

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    Ok, i managed to get somewhere.

    The machine i was testing was running Windows 10 x64 @ Outlook 2016
    Client's machine was Windows 7 x64 @ Outlook 2013

    Because on my machine was running smoothly I thought the right thing to do is update he's Outlook to 2016. No luck.
    Then i've tried applying the proper patch from Microsoft Update Catalog. Again, no luck.
    Last thing was changing the cipher to

    Code:
    ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:!DSS
    and update Options for SSL to

    Code:
    +no_sslv2
    I've than tried to add the account to Outlook with AutoConfig, it said no encrypted connection available so I've just proceeded with the Non-SSL connection and finally managed to send emails.

    Now I can say that more or less I "solved" the problem, but is the right config for the server? Or should I rather revert changes to default and upgrade the clients OS to Windows 10?
     
  7. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    As far as the Windows 7 workstation, this is more of an issue that Microsoft's support would need to help you. It's the same issue that's referenced on the following thread:

    An encrypted connection to your mail server is not available

    Another option would be to evert the changes and see if that user could update to a newer OS.

    Thank you.
     
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