The following message to <xxx.xxx@gmail.com> was undeliverable.
The reason for the problem:
5.3.0 - Other mail system problem 550-'5.7.26 This mail is unauthenticated, which poses a security risk to the\n5.7.26 sender and Gmail users, and has been blocked. The sender must\n5.7.26 authenticate with at least one of SPF or DKIM. For this message,\n5.7.26 DKIM checks did not pass and SPF check for [quatannens.net] did not\n5.7.26 pass with ip: [195.238.20.248]. The sender should visit\n5.7.26 https://support.google.com/mail/answer/81126#authentication for\n5.7.26 instructions on setting up authentication. w19-20020a056402071300b005218c27b17bsi2209875edx.499 - gsmtp'
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