This is the mail system at host smtp3.osuosl.org.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
audreyc12@gmail.com: host gmail-smtp-in.l.google.com[192.178.153.26] said: 550-5.7.25 [140.211.166.136] The IP address sending this message does not have a 550-5.7.25 PTR record setup, or the corresponding forward DNS entry does not 550-5.7.25 match the sending IP. As a policy, Gmail does not accept messages 550-5.7.25 from IPs with missing PTR records. For more information, go to 550-5.7.25 https://support.google.com/a?p=sender-guidelines-ip 550-5.7.25 To learn more about Gmail requirements for bulk senders, visit 550 5.7.25 https://support.google.com/a?p=sender-guidelines. af79cd13be357-7e87e23839csi549796785a.1222 - gsmtp (in reply to end of DATA command)