Issue with sending e-mail from the account

Question

Issue with sending e-mail from the account

Kinga Maria Krywult 0

Hello,

I have a problem with sending e-mail from the academic mail. When I send the mail I see the information about the receiving e-mail's server error. Does anyone know how to solve it?

0 comments

1 answer

Your answer

Answer 1

Anonymous

Hi @Kinga Maria Krywult,

Thank you for posting your question in the Microsoft Q&A forum.

To better understand the issue and narrow down the cause, could you please provide a bit more information?

What is the exact error message or bounce back message you receive from the recipient's mail server?
Are you able to send emails successfully to other recipients, or does the issue occur with every email you send?
Are you using Outlook on the web, Outlook desktop, or another email client?
Is this an academic Microsoft 365 account provided by your school or university?
Did this issue start recently, or has it been happening since you first started using the account?
Does the problem occur only when sending to a specific domain or organization?
Have you tried sending a simple test email (without attachments) to see if the result is the same?
If possible, could you share a screenshot of the error message, making sure to remove any personal or sensitive information before posting?

The exact server error message is especially important, as it can help identify whether the issue is related to the sender account, recipient server, message size, authentication, or another mail routing problem.

Thank you for your time and cooperation. I appreciate your patience, and I'll be happy to assist further once you provide the additional information above.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Kinga Maria Krywult 0 Reputation points

2026-07-10T16:18:26.55+00:00

Hello,

thank you very much for your help- the message on depicted on the screenshot is the exact message I received.

The e-mail I am trying to send a message from is my academic e-mail and the Microsoft 365 account the e-mail is connected to is also an academic account. The issue has been happening since my first attempt to sending an e-mail- since my first usage of the account. The error occurs regardless of the recipient I want to send an e-mail to.
Kinga Maria Krywult 0 Reputation points

2026-07-10T16:19:46.07+00:00
Kinga Maria Krywult 0 Reputation points

2026-07-10T16:26:18.0666667+00:00

I received the information, that the message was rejected by the recipient, but the error occurs regardless of the recipient I want to contact- it occurs with every attempt to sending a mail to any recipient.
Kinga Maria Krywult 0 Reputation points

2026-07-10T16:29:18.4066667+00:00
Anonymous

2026-07-13T09:50:12.6+00:00

Hi @Kinga Maria Krywult,

Thank you for your response and for providing the additional details and screenshot. I appreciate your time and cooperation.

Based on the information you shared, the issue has occurred since the account was first used, and it affects all recipients rather than a specific email address or domain. The screenshot also shows the error:

550 5.0.350 Remote server returned an error -> 550 #5.1.0 Address rejected

According to Microsoft's documentation, error 550 5.0.350 is a generic non-delivery report generated when the recipient's mail system rejects the message, while 550 5.1.0 Address rejected indicates that the destination mail server is not accepting messages from the sender or sender organization.

Since you are using a school-provided Microsoft 365 account, I strongly recommend contacting your university or institution's IT administrator. They have access to the Exchange Online configuration, mail flow settings, and security policies for your organization, and can investigate whether there is a configuration issue affecting your account or domain.

You may find the following Microsoft articles helpful and can share them with your IT administrator for reference:

Fix NDR error 550 5.0.350 in Exchange Online - Exchange | Microsoft Learn

Fix NDR error 550 5.1.0 in Exchange Online - Exchange | Microsoft Learn

I apologize that I cannot provide a direct fix from the forum side. As a forum moderator, I do not have access to your school's Microsoft 365 tenant or the administrative tools required to investigate and modify organizational mail settings. Only your institution's IT administrators can perform those checks and make any necessary changes.

Thank you for your patience and understanding. I hope your IT team will be able to identify the root cause quickly.
Kinga Maria Krywult 0 Reputation points

2026-07-13T12:24:10.0133333+00:00

Dear @Anonymous ,

thank you very much for your help.

Kind regards
Anonymous

2026-07-13T14:49:43.46+00:00

Hi @Kinga Maria Krywult,

I’m really glad to hear that my information is helpful

Please don’t hesitate to reach out anytime you need support. I’m always here to help.

If the answer is helpful, please click "Yes". As other users will also search information in this community, your valuable vote will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.

Take care, and have a great day ahead!