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Email sent from Dynamics through Outlook fails - Puts a =SMTP: prefix to recipient

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Posted on by Microsoft Employee

I have a user who can't send email from dynamics.

Everytime he creates an email activity and hit "send", the mail is synchronized to Outlook to send, but the recipients email contains a prefix "=SMTP:" which looks like so :

"=SMTP:email@contoso.com" instead of just "email@contoso.com"

This obviously lead to a sending failure in Outlook.

I cannot understand how this happens only for this user.

The user is running Dynamics 365 through Chrome and Outlook 365, Window 7.

  • Community Member Profile Picture
    Community Member Microsoft Employee on at
    RE: Email sent from Dynamics through Outlook fails - Puts a =SMTP: prefix to recipient

    We are using Outlook sync, not server side sync.

    Dynamics version is "Version 1612 (8.2.2.112) (DB 8.2.2.112) on-premises"

    I do confirm this happens when sending a mail from dynamics (browser side).

    Tracking an outlook item works as it should.

  • LuHao Profile Picture
    LuHao 40,874 on at
    RE: Email sent from Dynamics through Outlook fails - Puts a =SMTP: prefix to recipient

    Hi PierreBurton,

    How do you configure server-side synchronization?

    Please note that server-side synchronization does not support mixed use of Exchange / SMTP and POP3 / Exchange. You could refer to this article.

    You could provide a screenshot of your settings. like this:

    crm_2D00_itpro_2D00_exchangeonlinessssettingspop.png

    Could you provide your D365 version and Outlook version? Is D365 online or on-premises?

    Hope this helps.

    Best Regards,

    Lu Hao

  • sanp Profile Picture
    sanp 320 on at
    RE: Email sent from Dynamics through Outlook fails - Puts a =SMTP: prefix to recipient

    Can you please provide below info?

    1. please confirm if you are sending an email from web?

    2. What is the sync mechanism are you using? Server side sync or outlook sync.

    3. If you send an email from outlook and then track it,  does it work?

    4. Please confirm the server and client version that you are using.

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