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My smtp service does not show the statuses of sent emails – “read” and “follow the link”. The technical support of the smtp service says that there should be three Content-Types in the sent letter in order for the statistics to be tracked:
– Content-Type: multipart / alternative; // Description of the fact that the message consists of two parts presented in different formats
– Content-Type: text / plain; // Message type in plain text
– Content-Type: text / html; // Message in html format
Is it possible to include all three Content-Type