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Unable to send SMTP using mailx
I am trying to send SMTP email from the Linux mailx command; however, no matter how I try, the return from the server is always Authentication unsuccessful. I did: - Setup connector in Office 365 e...
I found the resolution.
The issue is at the MX record's IP address was not allowed in the firewall.
Also I had to request for IP and domain white listing in the Spamhaus.
If you cannot send SMTP using Mailx, consider alternative SMTP Service Providers like Digitalaka™, Sendinblue, Mailgun, or SMTPget. These services offer reliable email delivery and robust features to ensure your emails reach their destination. Check your mailx configuration and ensure proper authentication and server settings. Switching to a dedicated SMTP service can simplify and enhance your email-sending process.