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.