09-25-2010 1:36 PM
The sending of emails with large attachments using Outlook is not working well with our new U-Verse service. We switched from Cox as our Internet provider to ATT U-Verse 9 days ago. Everyting -- phone, television, and basic email are working well-- except this email issue of attachments. Although we are supposed to have a maximum of 25 MG per email, we cannot send anything beyond about 18 MBs. To do that I have to disable the virus scan for emails. Sending large emails of this size was never a problem with our Cox service and the maximum email size was 20MB. Has anyone had this problem? Any solutions to recommend? I spent 2 hours on the phone with tech support and they could not help me; they suspect the problem has something to do with Outlook settings. I was referred to the ATT fee-based support or calling Microsoft.
09-25-2010 2:46 PM
E-mail file attachments are typically encoded with a method called base64. Base64 expands the size of a file by approximately 1/3.
If 25 MB is the AT&T limit, then that is for the base64 encoded e-mail. This limits the unencoded file to 3/4 * 25 MB = ~ 18.75 MB. There is another tiny amount reserved for overhead, so 18 MB is approximately the limit.
You can send the file in multiple pieces if you want by using a zip program (like WinZip or 7Zip) and specifying that the .zip archive be split into 17 MB pieces. Then send each one as a separate e-mail. The person on the other end can then use the same .zip program to reassemble them.
09-25-2010 5:55 PM
Thanks for the suggestions. I was afraid that the amount I was sending plus the amount needed for encoding was pushing me over the limit. I will keep in mind your suggestions for sending multiple emails using a zip program. Thanks again.
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