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Resolving Email Sending Issues with FluentSMTP and Microsoft Office 365 After Server Migration

After migrating a client’s website to a new server, I encountered a problem where FluentSMTP and Microsoft Office 365 were no longer sending emails. The solution to this issue was straightforward: I created a new app on Microsoft Azure and reconnected it to FluentSMTP on the website.

By doing this, I was able to restore email functionality seamlessly. This process involved generating new credentials for the Azure app and updating the SMTP settings on the website to ensure secure communication between the server and Office 365.

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104 Comments

  1. I was getting ‘Connection refused’ errors with our company’s Office 365. Turns out the port configuration was wrong. Your guide helped me fix it.

    1. Port configuration is one of the most common issues with SMTP setup. Glad the guide pointed you in the right direction!

    1. This guide focuses on Microsoft 365 cloud. Exchange on-premise has a different authentication flow, but the SMTP principles are similar.

  2. FluentSMTP with Microsoft 365 was a nightmare to configure. This guide made the OAuth2 setup clear and straightforward.

  3. I was getting ‘Connection refused’ errors with our company’s Office 365. Turns out the port configuration was wrong. Your guide helped me fix it.

    1. Port configuration is one of the most common issues with SMTP setup. Glad the guide pointed you in the right direction!

    1. This guide focuses on Microsoft 365 cloud. Exchange on-premise has a different authentication flow, but the SMTP principles are similar.

  4. FluentSMTP with Microsoft 365 was a nightmare to configure. This guide made the OAuth2 setup clear and straightforward.

  5. I was getting ‘Connection refused’ errors with our company’s Office 365. Turns out the port configuration was wrong. Your guide helped me fix it.

    1. Port configuration is one of the most common issues with SMTP setup. Glad the guide pointed you in the right direction!

    1. This guide focuses on Microsoft 365 cloud. Exchange on-premise has a different authentication flow, but the SMTP principles are similar.

  6. FluentSMTP with Microsoft 365 was a nightmare to configure. This guide made the OAuth2 setup clear and straightforward.

  7. Getting ‘Connection refused’ errors with our Office 365. Port config was wrong. Fixed now!

  8. We switched from WP Mail SMTP to FluentSMTP and hit this exact issue. This article saved us.

  9. The Azure App Registration steps were exactly what I was missing. Microsoft docs are confusing.

  10. Our marketing team was losing leads because contact form emails weren’t delivering. Fixed now thanks to this.

  11. Does this solution handle the token refresh automatically or do I need to re-authenticate periodically?

  12. Getting ‘Connection refused’ errors with our Office 365. Port config was wrong. Fixed now!

  13. Our marketing team was losing leads because contact form emails weren’t delivering. Fixed now thanks to this.

  14. Does this solution handle the token refresh automatically or do I need to re-authenticate periodically?

  15. Our marketing team was losing leads because contact form emails weren’t delivering. Fixed now thanks to this.

  16. Does this solution handle the token refresh automatically or do I need to re-authenticate periodically?

  17. Getting ‘Connection refused’ errors with our Office 365. Port config was wrong. Fixed now!

  18. Our marketing team was losing leads because contact form emails weren’t delivering. Fixed now thanks to this.

  19. Does this solution handle the token refresh automatically or do I need to re-authenticate periodically?

  20. Our marketing team was losing leads because contact form emails weren’t delivering. Fixed now thanks to this.

  21. Does this solution handle the token refresh automatically or do I need to re-authenticate periodically?

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