Anyone else getting these bounces -- looks like a misconfiguration somewhere? -------- Original Message -------- Subject: Undeliverable: Re: tcp mss clamping or ... ? Date: Tue, 29 Nov 2022 20:09:28 +0000 From: To: References: <6385568C.6040308@tlinx.org> <638666DD.4020000@tlinx.org> *Delivery has failed to these recipients or groups:* amdlnx60@googlemail.com mailto:amdlnx60@googlemail.com Your message wasn't delivered because the recipient's email provider rejected it. *Diagnostic information for administrators:* Generating server: GV1P251MB0793.EURP251.PROD.OUTLOOK.COM amdlnx60@googlemail.com Remote Server returned '550-5.7.26 This message does not pass authentication checks (SPF and DKIM both 550-5.7.26 do not pass). SPF check for [tlinx.org] does not pass with ip: 550-5.7.26 [2a01:111:f400:7e0e::200].To best protect our users from spam, the 550-5.7.26 message has been blocked. 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