MX record getting error message 550-has installed an invalid MX record with an IP address.
And one more thing I just want to send mails through antispam not for incoming so why I need to set mx record to mx.spamexperts.com I want it to be my own server IP 101.53.136.191, when I am sending emails without setting your MX record getting error message 550-has installed an invalid MX record with an IP address. From what I can see you've managed to get it working correctly. Regarding your inquiry, you don't need to change the MX records of a domain if don't use incoming filtering for that domain as well. The 550-has installed an invalid MX record with an IP address the error relates to the messages that were rejected because the sender's address couldn't be verified with a null callout. The filtering servers do a 'null sender' callout to verify the sender. This means that the filtering server will connect to the sending addresses mailserver, using a sender of "<>" (just as a bounce message does), and the specified sender as ...