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email refused when sending to mail.protection.outlook.com

[Guild, Linda]
Linda Guild
Newbie
Newbie
Posts: 3
Linda Guild - 03:44pm, Nov 25 2019

Hi,

We are suddenly having an issue when sending to someone who uses mail.protection.outlook.com. It will connect and then the other side will disconnect. Attached is what we are seeing for an error. We are not having issues sending to anyone else.

Thanks,
Linda

Attachments:

email issues.docx (17 KB)


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Linda Guild - Dec 2, 2019 1:37 pm (#2 Total: 6)  

 

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Linda Guild
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Newbie
Posts: 3
Hi,

What is the right format to whitelist for STARTTTLS?

THanks,
Linda

Tyler Davis - Dec 4, 2019 9:57 am (#3 Total: 6)  

Alt-N Technical Support  

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Tyler Davis
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Posts: 251

MDaemon
RelayFax
SecurityGateway
Outlook Connector
SecurityPlus
ProtectionPlus
WebAdmin
IP addresses and Host names can be added to the STARTTLS Whitelist. In your log submission, the servers responding with host names in the 220 statements when MDaemon connects could be used or the IP address resolved by your DNS servers.

Wildcards are also accepted for host names and IP addresses. In the case of your first two connection failures, *.mail.protection.outlook.com could be added. However, this would have all connections to O365 servers not use STARTTLS, which may not be desired. If the Office 365 configuration requires STARTTLS, the connection will not succeed.

--
Tyler Davis
MDaemon Technologies
https://www.mdaemon.com

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Replies to this message
  • Andrew Genung (Dec 16, 2019 7:27 pm)


  • Andrew Genung - Dec 16, 2019 7:27 pm (#4 Total: 6)  

     

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    Andrew Genung
    Newbie
    Newbie
    Posts: 2
    Replying to: Tyler Davis (Dec 4, 2019 9:57 am)
    IP addresses and Host names can be added to the STARTTLS Whitelist. In your log submission, the servers responding...

    Did you find a resolution to this. We are also seeing this issue, only when sending *protection.outlook.com gateways.

    Andrew Genung - Dec 16, 2019 7:52 pm (#5 Total: 6)  

     

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    Andrew Genung
    Newbie
    Newbie
    Posts: 2
    We were able to get this working by adding *.protection.outlook.com to the STARTTLS Whitelist. This must be a bug in the software or with one of the AV/Scanning plugins.

    This problem started two weeks ago.

    Attachments:

    Capture-starttls.JPG (42 KB) (795 Downloads)


    Tyler Davis - Dec 26, 2019 4:57 pm (#6 Total: 6)  

    Alt-N Technical Support  

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    Tyler Davis
    Frequent
    Frequent
    Posts: 251

    MDaemon
    RelayFax
    SecurityGateway
    Outlook Connector
    SecurityPlus
    ProtectionPlus
    WebAdmin
    Where you receiving the same errors as the original poster about the "socket connection closed by the other side" or something else in the SMTP log? If unsure, please submit the SMTP-(out) log on the date the issue occurred to us using the request support link in my signature and a technician can help review your log file.

    The logs folder is /MDaemon/Logs by default. You can verify which directory by reviewing the Log Mode menu in the Server Settings / Logging menu.

    http://help.altn.com/mdaemon/en/index.html?log_mode.htm

    --
    Tyler Davis
    MDaemon Technologies
    https://www.mdaemon.com

    ---------------------------------------------------------------------
    These forums are provided by MDaemon Technologies for user-to-user
    support and discussion. MDaemon staff members may participate in the
    forums periodically but please recognize that this is not the official
    method of receiving technical support. To receive personal technical
    support please use the form here:
    http://www.altn.com/Support/RequestSupport/
    ---------------------------------------------------------------------



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