Skip to content

SMTP error codes

Mail servers produce Simple Mail Transfer Protocol (SMTP) codes in response to transaction requests. Some of these response codes indicate errors.

You may see the following errors:

Error code Description
XGEMAIL_0001 Message didn't contain a valid DKIM signature.
XGEMAIL_0002 Message failed a SPF check.
XGEMAIL_0003 Message failed a DMARC check.
XGEMAIL_0004 Sender IP address failed a RBL test.
XGEMAIL_0005 Sender domain failed a DBL test.
XGEMAIL_0006 Message rejected because the TLS version used doesn't match the version configured in your policy.
XGEMAIL_0007 Message rejected because your license has expired.