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countertech2@gmail.com: host gmail-smtp-in.l.google.com[142.251.163.27] said: 550-5.7.26 The MAIL FROM domain [inkscape.org] has an SPF record with a hard 550-5.7.26 fail policy (-all) but it fails to pass SPF checks with the ip: 550-5.7.26 [166.143.157.144]. To best protect our users from spam and phishing, 550-5.7.26 the message has been blocked. For instructions on setting up 550-5.7.26 authentication, go to 550 5.7.26 https://support.google.com/mail/answer/81126#authentication d75a77b69052e-48b960cdb4dsi92512671cf.81 - gsmtp (in reply to end of DATA command)