Hi Jorge, I understand that the emails sent from the external 'SendGrid' were blocked in Office 365. Have more questions? We had barracuda before and for the most part are happy with it. (Sender Policy Framework), this may cause the messages to be refused due to SPF violations. Configure outbound spam filtering - Office 365 | Microsoft. Gmail is one of the most frequently used email clients, and it shows this message when a sender sends an email from an IP address that is not included in the SPF record or from a spoofed "From" address. ![]() These errors often indicate the message violates a security or policy setting configured on the recipient's email servers. ![]() How to fix email error "550 permanent failure blocked" and recently enabled SPF check up in the device with soft/hard fail TAG option for SFP checkup. Only send mail to people who want to get messages from you.
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