Product
Docs
Resources
Log In

Sign Up

Error: SMTP Error 556

What's Causing This Error

SMTP error 556 usually occurs when the email sent is too large for the recipient's email server to process since the email server sets limits; this is usually when an email contains a large thread or attachment.

Solution - Here's How To Resolve It

To resolve this issue, ensure that the maximum email size is within the limits set by the recipient's email server. Also, if the attachment is too large, consider splitting the attachment or use suitable compressing technology to reduce the size of the email/attachment.

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

© 2023 Courier. All rights reserved.