Product
Docs
Resources
Log In

Error: SMTP Error 538

What's Causing This Error

SMTP error 538 occurs when the authentication mechanism requires encryption to complete a client's authentication process, and without the encryption, the authentication process fails. It is primarily due to the mail server or email providers requiring encryption to add a layer of security to the authentication process.

Solution - Here's How To Resolve It

To resolve this error, the client must contain the required encryption to authenticate with the email server successfully. These settings may include TLS versions and encryption algorithms.

The user must obtain these encryption requirements from the email server administrator/email service provider.

Other Common SMTP Errors (and Solutions)

View all errors

Build your first notification in minutes

Send up to 10,000 notifications every month, for free.

Email & push notification

Build your first notification in minutes

Send up to 10,000 notifications every month, for free.

Email & push notification

Product

Pricing

Providers

Developers

Documentation

API

Libraries

Status

© 2022 Courier. All rights reserved.