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    try this instead  ·  6 comments  ·  Office 365 Admin » Exchange Admin  ·  Flag idea as inappropriate…  ·  Admin →
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    ITzik commented  · 

    Hi, what are the max recipients limit of the SMTP relay option? is it the same max 500 limitation of mailbox submission? Thanks.

    I have a customer got realy NDR of "Too Many Recipients" while tryng to send a message with 450 recipients.


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