Jul 15 2022 01:45 PM
Hello,
Users whose mailbox is on office 365 are unable to send emails more than 25MB from IOS mail app
Checked same issue reported for exchange 2016 and it is suggested to change uploadreadaheadsize value and maxAllowedContentLength value
How values can be altered in office 365
Sep 07 2022 12:31 PM
Hello, @Ajit Terdalkar, my suggestion is to reduce the size of the attachment. The simplest way to do this is to compress the file or split it into several files.
It is even simpler to upload your file to any cloud and just to give the link to the files to download. Here you can find more tips on the workarounds concerning your question, such as getting a bigger limit with iCloud Mail Drop and compressing your attachment in a ZIP folder.
If you are serious about data safety, I recommend visiting this useful link, if you want your important Microsoft 365 data to be recoverable in any unpredictable situation.