Having issue sending email using Charter Spectrum account.

I have been trying since last April to send email from my Charter.net account.  I can send via my cell phone, which is not ideal.  I have seen a few articles stating that the error I am getting is because of a DNS configuration issue with my IP address.  I have confirmed that it is not my antivirus, and I have turned off my VPN when trying to send.  Apparently @XfinityAlex solved this problem before and it appears that a PTR record may be missing.  Can someone assist me with this issue?