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Mail and other client for e-mail - SMTP error

Hi all!
Recently, a firewall of your brand was installed in my office. Unfortunately, my colleagues and I find problems when sending mail with various clients (for example, Mail, Thunderbird, etc.). The error that is restituted refers to problems related to the SMTP. Can you suggest me a solution? (I tested Gmail and Yahoo acconunts and they have the same problem).

 

Thank you all for your time.

 



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