![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(204.8, 37%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ER%3C/text%3E%3C/svg%3E)
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
1,333 questions
Hi @roy ，
The following information needs to be confirmed with you:
1.Are you having trouble sending emails from your mobile device?
2.Are you able to send emails from Outlook and OWA successfully?
3.What is the size of the mail you send? The maximum size for a message sent by Exchange ActiveSync client is 10 MB by default.
If the attachment size of the message exceeds 10MB, then you need to configure the web.config file on the Mailbox server to modify the limit of Exchange ActiveSync.
a.Edited the web.config file in %ExchangeInstallPath%FrontEnd\HttpProxy\Sync and %ExchangeInstallPath%FrontEnd\HttpProxy\Sync to change the maxRequestLength.
b.Edited the web.config file in %ExchangeInstallPath%FrontEnd\HttpProxy\Sync to change the MaxDocumentDataSize.
c.Restart IIS using iisreset command.
For reference: Configure client-specific message size limits in Exchange Server.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.