Configuring Postfix for SMTPUTF8

Oct 13, 2025 by miodeya.com 105 views

Introduction

As a system administrator, you may encounter various issues with email delivery, including mail bounces. In this article, we will discuss a specific error message that may appear in your mail logs: "SMTPUTF8 is required, but was not offered." This error is related to the use of non-ASCII characters in email addresses and the requirement for SMTPUTF8 support in modern email systems.

Understanding SMTPUTF8

SMTPUTF8 is a feature introduced in SMTP (Simple Mail Transfer Protocol) to support the transmission of email messages containing non-ASCII characters. This feature allows email systems to send and receive messages with characters like ä, é, ö, and others that are not part of the traditional ASCII character set.

The Problem: Non-ASCII Characters in Email Addresses

When you send an email to a recipient with a non-ASCII character in their email address, the email system may not be able to deliver the message if it does not support SMTPUTF8. This is because the email system may not be able to correctly interpret the non-ASCII characters in the recipient's email address.

The Error Message: "SMTPUTF8 is Required, but Was Not Offered"

The error message "SMTPUTF8 is required, but was not offered" typically appears in the mail logs when a mail server attempts to deliver an email message to a recipient with a non-ASCII character in their email address. This error message indicates that the mail server requires SMTPUTF8 support to deliver the message, but the receiving mail server does not offer this feature.

Postfix and SMTPUTF8

Postfix is a popular mail server software that supports SMTPUTF8. However, if Postfix is not configured to offer SMTPUTF8 support, it may not be able to deliver email messages to recipients with non-ASCII characters in their email addresses.

Configuring Postfix for SMTPUTF8

To configure Postfix for SMTPUTF8 support, you need to add the following line to the main.cf file:

smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols 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**Mail Bounces: SMTPUTF8 is Required, but Was Not Offered**
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Q&A: Troubleshooting Mail Bounces with SMTPUTF8
Q: What is SMTPUTF8 and why is it required?
A: SMTPUTF8 is a feature introduced in SMTP to support the transmission of email messages containing non-ASCII characters. It is required to deliver email messages with non-ASCII characters in the recipient's email address.
Q: What is the error message "SMTPUTF8 is required, but was not offered" and how do I fix it?
A: The error message "SMTPUTF8 is required, but was not offered" typically appears in the mail logs when a mail server attempts to deliver an email message to a recipient with a non-ASCII character in their email address. To fix this issue, you need to configure your mail server to offer SMTPUTF8 support. For Postfix, you can add the following line to the main.cf file:
smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols 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smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols smtpd_tls_mandatory_protocols = smtpd_tls_mandatory_protocols 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