Hello good morning, I have a problem with sending / receiving emails by SMTP or IMAP / POP, the application is installed on a server IIS8.5 (PHP 7.4.13) on a Windows Server 2012 R2 and a MariaDB 5.5, in He is installed the Karspersky Antivirus with the Firewall removed and without Proxy server.
So when I try to connect the server to the SMTP or to a mailbox by IMAP / POP with the kaspersky protection activated it cuts the connection and when I turn it off it works perfectly, so the question I have is if I have to add some type of exclusion or enable a specific port so that it does not block me, the SMTP and IMAP / POP ports I have released.

Thank you very much and good day.

    I add that if I do a command telnet from that server it works perfectly

    Can you paste the errors into the thread so that I can use google translate on them?

    these would be the errors:

    Failed to connect to ServerIP:25 [SMTP: Invalid response code received from server (code: -1, response: )]

    TLS/SSL failure for outlook.office365.com: Unexpected TCP input disconnect

    uncheck "Header Spoofing"
    update your port on SMTP to 587.

    Everything else looks the same as the settings we use.

    Artmikel So when I try to connect the server to the SMTP or to a mailbox by IMAP / POP with the kaspersky protection activated it cuts the connection and when I turn it off it works perfectly, so the question I have is if I have to add some type of exclusion or enable a specific port so that it does not block me, the SMTP and IMAP / POP ports I have released.

    Since it works fine when shut off, then yes Kaspersky will need to have an exception setup for the connection to be allowed.

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