"WHM >> Exim Configuration Manager >> Basic Editor" on the cPanel server you are sending the message to and add the IP address the message is coming from under the "Trusted SMTP IP addresses" option.
cuenta@remotedomain
(ultimately generated from cuenta@localdomain)
host remotedomain [xxx.xxx.xx.xx]
SMTP error from remote mail server after RCPT TO:<cuenta@remotedomain>:
550-Verification failed for <cuentahost@localhostname>
550-The mail server could not deliver mail to cuentahost@localhostnam. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.
550 Sender verify failed
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