Unable to send email in Plesk: mail transport unavailable

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    Krzysztof Piciw

    I had traffic to port 25 blocked by INOS - probably "inherited" network settings from a previous user of my current IP address.
    Don't waste your time (I did! No thanks IONOS!) and first check if you can connect to any known external mail server using telnet from the command line.
    I.e. $ telnet aspmx2.googlemail.com 25

    If you can't connect - call Customer Service

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