# Pastebin KB2xkJUD
<kode54@gmail.com>: host gmail-smtp-in.l.google.com[142.250.107.26] said:
    550-5.7.26 This mail has been blocked because the sender is
    unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with
    either SPF or DKIM. 550-5.7.26  550-5.7.26  Authentication results:
    550-5.7.26  DKIM = did not pass 550-5.7.26  SPF [lists.freedesktop.org]
    with ip: [131.252.210.177] = did not 550-5.7.26 pass 550-5.7.26  550-5.7.26
    For instructions on setting up authentication, go to 550 5.7.26
    https://support.google.com/mail/answer/81126#authentication
    be9-20020a170902aa0900b001d04e2f99b6si6620365plb.316 - gsmtp (in reply to
    end of DATA command)