Relay Access Denied

Send mail is okay.
I’m not receive any mail.

mxtoolbox:

220 box.****** ESMTP Hi, I’m a Mail-in-a-Box (Ubuntu/Postfix) [641 ms]

EHLO PWS3.mxtoolbox.com

250-********

250-PIPELINING

250-SIZE 134217728

250-VRFY

250-ETRN

250-STARTTLS

250-ENHANCEDSTATUSCODES

250-8BITMIME

250 DSN [641 ms]

MAIL FROM:<****@*****>

250 2.1.0 Ok [641 ms]

RCPT TO:<****@*****>

554 5.7.1 <****@*****>: Relay access denied [751 ms]

Relay access denied is the intended response and configuration of Mail-in-a-Box. This shouldn’t nominally be causing an issue in receiving your email. Can you check your log files and see if there is an error reported there?