Home Forums Newsletter Plugin Support Sending via SMPT: Header count issue

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    Gareth Johns

    Just installed the newsletter plugin on our new site which sends everything via microsoft SMTP servers. When sending a test I get this error:

    Mailer: Outlook
    InvalidInternetMessageHeaderCollection: Maximum number of headers in one message should be less than or equal to 5.
    Date: 2020-10-21T17:23:53

    Any ideas? I’ve said yest to the “Disable unsubscribe headers” option.


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