Email: SMTP error 535 5.7.3 Authentication Unsuccessful

I get the following Lookout error when using the Mailer object to send emails:
 Email authentication is failed. SMTP error 535 5.7.3 Authentication Unsuccessful
It works just fine from my office location and other locations, but when I run the same program at my customer's location I get the above error.
I had the IT tech at AT&T open up port 25 on my customers internet account. Before she opened up the port, all I would get
is the error: Timeout during connection to SMTP server.
We use our company's SMTP server in the Mailer object, The SMTP requires authentication

Hi Marelise,
For now, I have enabled these accounts, but in such cases, it is recommended to reach out to chat support or submit a ticket to get faster resolution.
Do let me know if you have any question.

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