Just installed an ASA 5505 yesterday. Thought all was well.
When anyone emails into the server they get bounced messages with 550 errors.
SMTP error from remote mail server after RCPT TO:<radacted>:
host radacted [22.214.171.124]: 550-Please turn on SMTP Authentication in your mail client.
550-redacted (redacted) [126.96.36.199]:50533 is not
550 permitted to relay through this server without authentication.
Upon research I'm seeing a reverse dns error in mxtoolbox that that tells me that something is up with my reverse dns.
How do i edit or ad the nat rule int the firewall to allow reverse dns to see what its looking for?