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Check IMAP/SMTP Settings:
Open your AOL Mail account settings.
Ensure that IMAP (Incoming Mail Server) and SMTP (Outgoing Mail Server) settings are configured correctly.
Common settings:
IMAP Server: imap.aol.com
Port: 993
Security: SSL/TLS
SMTP Server: smtp.aol.com
Port: 587
Security: STARTTLS or SSL/TLS
Enable Less Secure Apps:
AOL may require you to allow access to less secure apps. Go to your AOL Account Security settings and enable "Allow apps that use less secure sign-in."