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microsoft-graph-apiexchangewebservices

Obtain max allowed message size for M365 user

I'm trying to figure out if I can use EWS or Graph to obtain, for a given user, the maximum allowed message size (as configured by the administrator). I'm using direct http calls, not the managed API. There is a lot of information I can obtain about users in the mailboxSettings resource, but that property does not seem to be one of them. Any help appreciated.

Solution

  • Its not exposed directly but you can use the MaxMessageSize MailTip (as long as they are enabled) for a mailbox which should return the max message size (mailbox or org depending on which is lower) eg

    https://graph.microsoft.com/v1.0/me/microsoft.graph.getMailTips

    {
    "EmailAddresses": [
        "[email protected]"
    ],
    "MailTipsOptions": "maxMessageSize"
}

    ref https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/mailtips/mailtips