Location:Home > Email Service Knowledge > Article content

14 Common Issues with SMTP Office365 Com Modern Authentication and How to Fix Them

GoodJack7Month Ago (09-20)Email Service Knowledge63

Hello everyone, I’m Kent, the website admin. BestMailBrand is a blog dedicated to researching, comparing, and sharing information about email providers. Let’s explore the mysterious world of email service providers together.



🔔🔔🔔 【Sponsored】

AOTsend is a Managed Email Service API for transactional email delivery. 99% Delivery, 98% Inbox Rate.
Start for Free. Get Your Free Quotas. Pay As You Go. $0.28 per 1000 Emails.


You might be interested in:
Why did we start the AOTsend project, Brand Story?
What is a Managed Email API, How it Works?
Best 24+ Email Marketing Service (Price, Pros&Cons Comparison)
Best 25+ Email Marketing Platforms (Authority,Keywords&Traffic Comparison)

🔔🔔🔔


AotSend Email API Best 24+ Email Marketing Service (Price, Pros&Cons Comparison) What is a Managed Email API, How it Works? Best 25+ Email Marketing Platforms (Compare Authority,Keywords&Traffic)

When it comes to email communication, SMTP, Office365, and Modern Authentication play crucial roles. However, users often encounter various issues while using these services. In this blog post, we'll discuss 14 common problems and their solutions to help you troubleshoot and resolve them efficiently.

1. SMTP Authentication Failure

Authentication failure is a common issue when setting up SMTP for Office365. This usually happens due to incorrect credentials or misconfigured settings. To fix this, ensure you're using the correct username and password, and double-check your SMTP server settings.

2. Office365 Connectivity Issues

If you're facing connectivity problems with Office365, it might be due to network restrictions or firewall settings. Check your network configuration and make sure Office365 URLs and IP addresses are not blocked.

3. Modern Authentication Not Working

Modern Authentication enhances security but can sometimes cause issues. If you're facing problems with Modern Authentication, ensure it's enabled in your Office365 tenant and that your application or device supports it.

4. SMTP Timeout Errors

SMTP timeout errors can occur due to various reasons, such as slow network connections or server overloads. To resolve this, increase the timeout settings in your SMTP configuration or contact your email provider for assistance.

5. Office365 Email Delivery Delays

If you're experiencing delays in email delivery, it could be due to high server load or email filtering policies. Check your Office365 message trace to identify any potential bottlenecks.

6. SMTP Relay Not Working

SMTP relay issues can arise from incorrect configuration or permission problems. Ensure your SMTP relay is set up correctly and that the necessary permissions are granted.

7. Office365 Inbox Rules Not Working

If your Office365 inbox rules are not working as expected, it might be due to conflicts or incorrect setup. Review your rules and make sure they are configured properly.

8. Modern Authentication Loop

Sometimes, users might get stuck in a Modern Authentication loop. This can be resolved by clearing cookies and cache or trying a different browser.

9. SMTP Error 550

Error 550 typically indicates that the recipient's mailbox is full or unavailable. Contact the recipient to check their mailbox status or try sending the email again later.

10. Office365 Email Sync Issues

Email sync problems can be caused by various factors, including network issues or device compatibility problems. Check your internet connection and device settings to resolve this.

11. SMTP TLS Negotiation Failed

TLS negotiation failures can occur due to mismatched encryption settings. Ensure both the sending and receiving servers support the same TLS version and cipher suites.

12. Office365 Attachment Size Limit

If you're unable to send large attachments, it's likely due to Office365's attachment size limit. Consider using OneDrive or SharePoint to share large files instead.

13. SMTP Greylisting

Greylisting is an anti-spam measure that can delay email delivery. If you suspect greylisting is affecting your emails, contact the recipient's email administrator.

14. Office365 SPF Record Issues

SPF (Sender Policy Framework) record problems can lead to email delivery failures. Ensure your SPF record is correctly configured to authorize your sending domain.

By addressing these common issues, you can ensure smoother email communication using SMTP, Office365, and Modern Authentication. Regularly reviewing and updating your settings can help prevent these problems in the future.

14 Common Issues with SMTP Office365 Com Modern Authentication and How to Fix Them

AotSend Email API Best 24+ Email Marketing Service (Price, Pros&Cons Comparison) What is a Managed Email API, How it Works? Best 25+ Email Marketing Platforms (Compare Authority,Keywords&Traffic)

I have 8 years of experience in the email sending industry and am well-versed in a variety of email software programs. Thank you for reading my website. Please feel free to contact me for any business inquiries.


    Scan the QR code to access on your mobile device.

    Copyright notice: This article is published by AotSend. Reproduction requires attribution.

    Article Link:https://www.bestmailbrand.com/post3714.html

    “14 Common Issues with SMTP Office365 Com Modern Authentication and How to Fix Them” 的Related Articles

    Best 7 Email Provider API Integrations for Enhanced Email Functionality

    Best 7 Email Provider API Integrations for Enhanced Email Functionality

    Best 7 Email Provider API Integrations for Enhanced Email FunctionalityIntroduction to Email Provider APIThe Email Provider API is a powerful tool tha...

    Top 7 HIPAA Email API Best Practices for Secure Healthcare Messaging

    Top 7 HIPAA Email API Best Practices for Secure Healthcare Messaging

    Top 7 HIPAA Email API Best Practices for Secure Healthcare Messaging1. Ensuring Compliance with HIPAA Email API StandardsWhen it comes to healthcare m...

    9 Effective Email Templates for Sending Documents

    9 Effective Email Templates for Sending Documents

    When it comes to sending documents via email, using a clear and professional template can make a world of difference. Not only does it ensure that you...

    16 Tips for Managing Gmail SMTP Password

    16 Tips for Managing Gmail SMTP Password

    Gmail is one of the most popular email services in the world, and with the rise of remote work, it's becoming increasingly important to manage our ema...

    16 Steps to Recover Forgot Email on Roblox

    16 Steps to Recover Forgot Email on Roblox

    Roblox, the popular online gaming platform, allows players to immerse themselves in a virtual world of creativity and fun. However, with the multitude...

    16 Steps to Activate Your Yahoo Account

    16 Steps to Activate Your Yahoo Account

    When it comes to email services, Yahoo Mail is one of the most popular choices. However, to enjoy its features, you need to activate your account firs...