Product
Docs
Resources
Log In

Sign Up

Error: SMTP Error 471

What's Causing This Error

You may run into the error if the anti-spam filter, anti-virus guard, or firewall prevents the message from sending. In most cases, your anti-virus guard may prevent the email from sending, or your email may contain spam-like phrases that get flagged as spam by your anti-spam filter.

Solution - Here's How To Resolve It

Firstly, verify that your message does not contain any possible spam words. For example, do not include phrases such as "You have won" or "Claim your reward" or language that may sound spam.

Secondly, disable your anti-virus guard/ firewall or anti-spam filter and try sending the email again.

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.

Get started for free

Email & push notification

Build your first notification in minutes

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

Get started for free

Email & push notification

Product

Pricing

Providers

Developers

Documentation

API

Libraries

Status

© 2022 Courier. All rights reserved.