Gsuite Server rejecting my email

Question

My emails are being rejected by the G Suite server despite having a good domain reputation, and we're not sending bulk emails through Microsoft Office 365.

This issue is impacting our business, and we need someone to address it promptly, or else we'll have to consider switching over to G Suite.

Answer 1

Dear Yatheesh Mohan

Good day! Thank you for posting in the Microsoft Community. We'll be happy to help!

First of all, we regret for the inconvenience caused to your work. Based on your description, I have a general understanding of your question, to help you better, I still need to gather more information to narrow down the scope of the question

• Are you using the new Outlook for Windows or classic Outlook for Windows?
• If your problem occurred in outlook desktop client, please kindly use your account to login OWA(outlook web app) and then create a test email to check whether you got the same error, thanks.
• In general, the system will automatically push the NDR (Non-Delivery Report) when the email cannot be sent, so if you receive any error messages or error codes when sending the email, please kindly share the full screenshot with me, thank you.
• You just can't send an email to the other person? I mean you can receive the email?

Please believe that I will do my best to do more research and testing to help you further when I get the feedback I need.

Please note that our initial response may not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

Thank you in advance for your understanding. Your patience and cooperation will be greatly appreciated. I hope for all the best!

Sincerely

Kerry Chen | Community Moderator

Answer 2

When encountering an issue with your G Suite (now Google Workspace) account where the server is rejecting your emails, several steps can be taken to diagnose and potentially resolve the issue. Here’s a step-by-step guide to help you address the problem:

1. Check Account Status and Quotas

• Verify Account Status: Make sure your Google Workspace account is active and not suspended. Check for any notifications within your admin console that could indicate an issue with your account status.
• Email Quotas: Google Workspace has sending limits. If you have sent an unusually high volume of emails, you might have hit your daily quota. Review these limits to ensure you have not exceeded them.

2. Review Error Messages

• Carefully read the error message received. Common rejection messages include "550 5.7.1", indicating a permissions or policy issue, or "421", indicating temporary issues related to email sending limits or network settings.
• Google Workspace might also send a detailed bounce message explaining why your email was rejected (e.g., due to suspected spam, large attachment sizes, or policy settings).

3. Check SMTP Settings

• If you're using an email client or third-party service to send emails, ensure that the SMTP settings are correctly configured. The typical settings for Google Workspace are:
  • SMTP server: smtp.gmail.com
  • Port: 587 (TLS) or 465 (SSL)
  • Authentication required: Yes
• Verify that your username (full email address) and password are correct.

4. Examine SPF, DKIM, and DMARC Records

• Incorrect or missing SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance) records can lead to email rejection. These are essential for preventing spoofing and ensuring that outgoing emails are authenticated.
• Use online tools to check your domain’s SPF, DKIM, and DMARC records. Make necessary adjustments as per Google’s guidelines for these records.

5. Check for Blacklists

• If your domain or IP has been blacklisted, emails sent from your account might be rejected by the recipient's email server. Use online blacklist checking tools to see if your domain/IP is listed and request removal if it is.

6. Investigate Email Content and Attachments

• Emails that appear to be spam or contain suspicious links or attachments may be rejected. Ensure that your emails comply with best practices for email content.
• Reduce the size of attachments, or use Google Drive links for sharing large files.

7. Contact Google Workspace Support

• If you cannot resolve the issue using the steps above, contact Google Workspace support. Provide them with the error messages you received, details about your account setup, and specific examples of rejected emails.

8. Verify Recipient Issues

• Sometimes the problem may be on the recipient's end. Verify if the recipient's email server is operational, or if there are any specific policies or configurations that might be rejecting your emails.

By systematically checking each of these factors, you should be able to pinpoint why your emails are being rejected and find a suitable solution. Remember that maintaining proper email practices and configurations not only helps in avoiding rejections but also enhances your domain's reputation and email deliverability.

Answer 3

Can you share the email headers of the bounced mail? Might be able to find some clues there.

Answer 4

[https://products.office.com/en-us/CMSImages/Office365Logo_Orange.png?version=b8d100a9-0a8b-8e6a-88e1-ef488fee0470] Your message to ******@revenantcare.net couldn't be delivered. revenantcare.net suspects your message is spam and rejected it. yatheesh Office 365 revenantcare.net Sender Action Required Messages suspected as spam

How to Fix It Try to modify your message, or change how you're sending the message, using the guidance in this article: Bulk E-mailing Best Practices for Senders Using Forefront Online Protection for Exchange<****>. Then resend your message. If you continue to experience the problem, contact the recipient by some other means (by phone, for example) and ask them to ask their email admin to add your email address, or your domain name, to their allowed senders list.

Was this helpful? Send feedback to Microsoft<https://go.microsoft.com/fwlink/p/?LinkID=717204>. ________________________________

More Info for Email Admins Status code: 550 5.7.350

When Office 365 tried to send the message to the recipient (outside Office 365), the recipient's email server (or email filtering service) suspected the sender's message is spam.

If the sender can't fix the problem by modifying their message, contact the recipient's email admin and ask them to add your domain name, or the sender's email address, to their list of allowed senders.

Although the sender may be able to alter the message contents to fix this issue, it's likely that only the recipient's email admin can fix this problem. Unfortunately, Office 365 Support is unlikely to be able to help fix these kinds of externally reported errors.

Original Message Details Created Date: 4/30/2024 3:52:36 PM Sender Address: yatheesh@digitaltechworks.cloud Recipient Address: ******@revenantcare.net Subject: Re: Conference Call Details DT & Revanant

Error Details Error: 550 5.7.350 Remote server returned message detected as spam -> 550 5.7.1 [2a01:111:f403:2020::701 19] Gmail has detected that this message;is likely suspicious due to the very low reputation of the sending;domain. To best protect our users from spam, the message has been;blocked. For more information, go to; https://support.google.com/mail/answer/188131 b20-20020a170902d89400b001e445b8108csi21562287plz.391 - gsmtp Message rejected by: mx.google.com

Notification Details Sent by: PN2P287MB0793.INDP287.PROD.OUTLOOK.COM

Message Hops HOP TIME (UTC) FROM TO WITH RELAY TIME 1 4/30/2024 3:52:36 PM PN2P287MB0453.INDP287.PROD.OUTLOOK.COM PN2P287MB0453.INDP287.PROD.OUTLOOK.COM mapi * 2 4/30/2024 3:52:36 PM PN2P287MB0453.INDP287.PROD.OUTLOOK.COM PN2P287MB0793.INDP287.PROD.OUTLOOK.COM Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) *

Original Message Headers

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Above is the report FYR

Answer 5

Microsoft has been having these issues lately.

My suggestion is to raise a support ticket and let Microsoft deal with it on the back end, as well as asking the affected recipient to whitelist Microsoft domains since they may also be having difficulties with other senders using Microsoft365 besides your company.