error sending notifications to yahoo mail

  • Hi,
    Thank you for your work ! Great plugin.
    Please excuse my English, is not very good.

    I have a problem to send notifications on yahoo address (mayby others too). My messages are not distributed (Message not allowed – Headers are not RFC compliant [291 ]) .

    I noticed that in emails received on working adress, I have 2 times the same recipient’s name (for example : To : [email protected], [email protected]). No double whith CC or CCI.

    Do you have an idea ?

    Thanks for your help

    https://www.ads-software.com/plugins/guiform/

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