IIS SMTP relay cannot send e-mail to our own domain. RRS feed

  • Question

  • Hi,

    we installed SMTP Relay with IIS for Microsoft 365. When I try to send e-mail from the printer or some devices the test mail does not deliver to the target domain even our own domain. But for some domains, it works.

    I couldn't find the reason of this issue. Hope someone can help me.

    thanks in advance

    Monday, April 5, 2021 1:58 PM

All replies

  • Hi, normal SMTP relay for domain will often trigger spam/junk policies. Did you try to check SMTP logs on IIS if e-mails gets submitted or Exchange message trace if message does not get junked? How you setup Receive Connectors or SPF records for domains?

    What about to try follow How to set up a multifunction device or application to send email using Microsoft 365 or Office 365 | Microsoft Docs?

    Monday, April 5, 2021 3:28 PM
  • Some domains does not support form mailing..
    Tuesday, August 10, 2021 5:07 PM
  • If the email does not get junked, then you may need to check the SMTP log file. This will tell you if you are having problems sending to specific domains. In most cases, DNS is the culprit.
    • Edited by HankFWilson Thursday, August 12, 2021 1:34 AM
    Thursday, August 12, 2021 1:32 AM
  • Hi,

    could you do this and share with us the smtp log?

    1) enble SMTP logs:
    to do it , => Open Start > Programs > Administrative Tools > Internet Information Service (IIS) Manager. Right click "Default SMTP Virtual Server" and choose "Properties". Check "Enable logging".

    2) Restart SMTP service or do IISRESET

    3) create a notepad file and fill with :

    FROM: <source email address> <=== fill with your mail source
    TO: <destination email address> <=== fill with your dest email
    SUBJECT: Test
    This is a test email

    3) put the file into as email.txt into this directory :

    4) wait a while...

    5) restart again the SMTP service or  IISRESET

    6) share the SMTP log. (C:\WINDOWS\system32\LogFiles\SMTPSVC1)


    • Edited by Marco Schiavon Monday, August 23, 2021 1:56 PM
    • Proposed as answer by Masstamilan Friday, September 3, 2021 10:15 AM
    Monday, August 23, 2021 1:55 PM
  • I know your are facing problem related to IMAP Server configuration. I hope you enter the right SMTP details. Other than wrong IMAP Configuration there are some factors like antivirus or firewall blocking some sites for unauthorized access. Sometimes, corrupt PST file also caused this issue. You can fix this issue by resolving Outgoing Server glitches. You can also fix inappropriate IMAP Server port issue to solve your Outlook cannot connect to IMAP Server problem. I hope this may resolve your issue and allow you to send emails.
    • Proposed as answer by mojaejalooti Tuesday, September 7, 2021 4:53 PM
    Tuesday, September 7, 2021 5:33 AM
  • <a href="https://">Click here</a>
    Tuesday, September 14, 2021 10:41 AM
    Tuesday, September 14, 2021 10:41 AM
  • Thank you for sharing this . its really helpfull . 

    Wednesday, September 15, 2021 11:52 AM
  • try to check SMTP logs on IIS if e-mails gets submitted or Exchange
    Sunday, October 17, 2021 3:16 PM
  • I think you put a great deal of exertion to make this.
    Friday, April 1, 2022 6:11 AM
  • I don't have any idea about this. 
    Tuesday, April 5, 2022 9:38 AM
  • hi.. that was my problem too. i solved it by reading here

    Monday, April 11, 2022 9:29 AM