Read the following reason, if you try the above solutions, do not fix your AOL mail problem. As your AOL operations may be restricted.
AOL mail server introduced new security policies for DMARC. All emails sent will be obtained by AOL Server first. If the outgoing SMTP setup has not been changed, AOL will continue to reject the messages.
To delete or re-configure the outgoing SMTP as:
IMAP server address: imap.aol.com
User name: Your AOL email address.
IMAP password: Your AOL Mail password
IMAP TLS/SSL required: yes
Enter the underlying settings for fighting the error “AOL blocking of emails.”
Incoming Mail Server: imap.aol.com
SMTP Outgoing Server Address: smtp.aol.com.
SMTP Username: Your AOL email address
SMTP password: AOL Mail password
If more help is necessary, reach AOL Support and find the services against the “Cannot Receive Email on AOL” error.