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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Email Sent from Shared...
Small and medium business | Business Central, N...
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Email Sent from Shared Mailbox in Business Central Marked as Spam

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Posted on by GGernhard 5

We recently changed from SMTP to using Shared Mailbox in Business Central for sending invoices.  We are using the same send as address.  Since the change, our customers that were receiving the SMTP mail without issue are reporting that our email is being marked as spam in there systems.  Is anyone else experiencing this issue?  Is there something we can do to change the emails to make them less likely to be marked as spam on the receiving end.

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Dynamics 365 Business Central
Dynamics 365 Business Central
  • Community member Profile Picture
    Community member 2 on at
    Email Sent from Shared Mailbox in Business Central Marked as Spam
    We have the same issue for our own BC tenant and also our customers. 

    Last few weeks I have been investigating this by sending mails between out customers. This is what I found.

    • Customers have SPF / DKIM / DMARC configured.
    • If customers emails that are sent from the users outlook client on the computer it gets delivered without issue.
    • If customers emails that are sent from BC with shared mailbox OR as current users it is marked as spam right away. 
    • If the first email gets deleted from the spam folder after x amount of days the next mail will get instantly deleted without ever ending up in the spam box.
    • When testing the mail with a “Mail Tester” for issues and “Spamminess” without any indication of issues, a perfect score with no risk for “spam”.
    • We have tested with body content of the email, changing subjects, removing PDF files but nothing seem to help.
    • When the logged in user named “Alice” sends the mail from BC from her personal email the mail is marked as spam. When “Alice” take the exact same mail and send from outlook client everything works fine. This leads me to that something is wrong with how BC send the email, nothing is wrong with the mail itself.

    Currently I think we need to contact Microsoft because I am out of ides.
    ​​​​​​​
  • Jason Kelton Profile Picture
    Jason Kelton 11 on at
    Email Sent from Shared Mailbox in Business Central Marked as Spam
    Yup we're having the exact same issue.  When running a test email, they get delivered fine but when sending an actual invoice etc., they get marked as spam with an SCL of 8 and high confidence phish.  Now we first thought this could have been our restrictive policies but that doesn't seem to be the case.
     
    Using SMTP is on the way out for Authenticated send, so not sure of what other options we have available.  Going to try the mail send types.
     
    Another thing we noticed in the MHA though is that it says Microsoft is sending DKIM but the original sender has no DKIM.
     
    Ta,
     
     
    Jase.
     
  • Community Member Profile Picture
    Community Member on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    So just an updated sorry have been offline and working other items. Put it back to a paid account and it started working correct for approximately 1 week now back detecting as a phishing attempt...

  • austinwillard Profile Picture
    austinwillard 20 on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    i've also had word from our customers that invoices are being filtered as spam when sent through BC.

    Have you found any resolution to this?

    one of the selling points of BC was that invoicing would be simpler...

  • Suggested answer
    Inge M. Bruvik Profile Picture
    Inge M. Bruvik 1,029 Moderator on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    Did you submit this to Microsoft as a supportcase through your CSP partner? If not that might be worth a try.

  • Laserchips@hotmail.com Profile Picture
    Laserchips@hotmail.com 5 on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    Same issue is being reported from other sources as well...I have already submitted this to Microsoft but nothing has changed...
    It even gets picked off as phishing email within Office 365 space...there is nothing in the email pdf attachment this is clean according to Microsoft Analytics and the email states one line - Here is your Invoice - any work arounds out there - Microsoft support?? - this is becoming a big problem!

  • Suggested answer
    Inge M. Bruvik Profile Picture
    Inge M. Bruvik 1,029 Moderator on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    Could there be a difference in formatting?

    Maybe some e-mails are sent as plain text and BC mails are HTML formatted?

  • GGernhard Profile Picture
    GGernhard 5 on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    The same exact email with the same exact attachement is not marked as spam when sent directly from the shared mailbox, it is only happening when using the send function from BC.

  • Suggested answer
    Inge M. Bruvik Profile Picture
    Inge M. Bruvik 1,029 Moderator on at
    RE: Email Sent from Shared Mailbox in Business Central Marked as Spam

    You should probably look at the e-mail body and add more text to your e-mail body.

    And e-mail body with little text, a short subject and an attachement has high likelihood of being marked as spam.

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