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Topic: Whitelist sender that doesn't have appropriate PTR records

I recently installed iredmail-pro version 1.0 MYSQL on Ubuntu 18.04 using apache. I found that a vendor and customer can't email me due to errors with their PTR records. I put the domain name and their mail server IP in the whitelist to allow but they still don't come through. What am I doing wrong to make an exception for that client that I need to be able allow since their ISP is incompetent?

Mar 11 10:43:32 mail postfix/postscreen[19709]: CONNECT from [216.155.208.55]:50
143 to [10.5.1.9]:25
Mar 11 10:43:39 mail postfix/postscreen[19709]: PASS NEW [216.155.208.55]:50143
Mar 11 10:43:39 mail postfix/smtpd[19769]: warning: hostname mail.rconnects.com
does not resolve to address 216.155.208.55
Mar 11 10:43:39 mail postfix/smtpd[19769]: connect from unknown[216.155.208.55]
Mar 11 10:43:39 mail postfix/smtpd[19769]: NOQUEUE: reject: RCPT from unknown[216.155.208.55]: 450 4.7.1 <ces-svr-it-mmail3.rcdws.com>: Helo command rejected: Host not found; from=<customer@cascadeaccess.com> to=<me@mydomain.com> proto=ESMTP helo=<ces-svr-it-mmail3.rcdws.com>
Mar 11 10:43:40 mail postfix/smtpd[19769]: lost connection after RCPT from unknown[216.155.208.55]
Mar 11 10:43:40 mail postfix/smtpd[19769]: disconnect from unknown[216.155.208.55] ehlo=1 mail=1 rcpt=0/1 commands=2/3

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Re: Whitelist sender that doesn't have appropriate PTR records

Please try to whitelist it in file /etc/postfix/sender_access.pcre like this:

202.96.100.1 OK

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Does my reply help a little? How about buying me a cup of coffee ($5) as an encouragement?

buy me a cup of coffee

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Re: Whitelist sender that doesn't have appropriate PTR records

Sorry my email didn't notify me of this reply. I added the following to that file for 2 companies that I can't get email from:

216.155.208.55 OK
40.128.126.210 OK

I restarted postfix and I still don't get their mail. Their incompetent IT isn't fixing their PTR records so I'm going to be forced to compensate for them.