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Maximum e-mail attachment size question

Posted by
Visitor
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Message 1 of 12
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Why is Comcast's maximum e-mail attachment size only 10MB?  This seems small to me and it's often not enough for me.  Especially since some files expand in size when you attach them.  In those cases, it'll only upload if the original file is only around 8MB or less.  It seems most servers have a maximum size of up to 25MB.  Why can't Comcast have that as well?

11 REPLIES
Posted by
Mac Expert

Message 2 of 12
6,699 Views

Comcast's limit is actually 15MB, but to allow room for headers, etc. the actual limit is closer to 10-12MB. 

 

As for why some email systems now allow larger attachemnt sizes: while convenient it's not necessarily a good thing. Email systems were never designed to move such large files, and when you add that to the amount of spam that is generated on a daily basis, it's a miracle that our email systems don't shut down more often than they do. 

 

In the old days, it was FTP that was designed to move large files across the net. Today, cloud-based storage systems like iCloud, Dropbox, even your Comcast online storage make this easier and faster.




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Posted by
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Message 3 of 12
1,852 Views

That's a good explanation and yet somehow it still says that Comcast's email is just inferior to may others who allow you to send a number of decent sized pictures all in the same email. Smiley Sad Soo sad for Comcast.

Posted by
Official Employee

Message 4 of 12
1,834 Views

phillipcecchini wrote:

That's a good explanation and yet somehow it still says that Comcast's email is just inferior to may others who allow you to send a number of decent sized pictures all in the same email. Smiley Sad Soo sad for Comcast.


phillipcecchini -

 

Are you using the xfinity webmail client, or some other client like Thunderbird?  We normally allow 35MB - if you're seeing different, then (once you confirm), I'll alert the webmail folks.

 

Thanks,


ComcastDaveL




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Posted by
Service Expert

Message 5 of 12
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CC_AA wrote:

phillipcecchini wrote:

That's a good explanation and yet somehow it still says that Comcast's email is just inferior to may others who allow you to send a number of decent sized pictures all in the same email. Smiley Sad Soo sad for Comcast.


phillipcecchini -

 

Are you using the xfinity webmail client, or some other client like Thunderbird?  We normally allow 35MB - if you're seeing different, then (once you confirm), I'll alert the webmail folks.

 

Thanks,


ComcastDaveL


When did this change from 25 MB?  If it is indeed 35 MB now, this page needs to be updated.




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Posted by
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Message 6 of 12
1,803 Views

I was trying to send 6 pics from my iPhone.  The total size was actually less than 1MB.  I sent the same email with a buisness class gmail account without incident.

Posted by
Official Employee

Message 7 of 12
1,797 Views

Again wrote:

CC_AA wrote:

phillipcecchini wrote:

That's a good explanation and yet somehow it still says that Comcast's email is just inferior to may others who allow you to send a number of decent sized pictures all in the same email. Smiley Sad Soo sad for Comcast.


phillipcecchini -

 

Are you using the xfinity webmail client, or some other client like Thunderbird?  We normally allow 35MB - if you're seeing different, then (once you confirm), I'll alert the webmail folks.

 

Thanks,


ComcastDaveL


When did this change from 25 MB?  If it is indeed 35 MB now, this page needs to be updated.


 

That's 35MB after encoding for transport.  So roughly 25MB of attachments, from a user's perspective.




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Posted by
Service Expert

Message 8 of 12
1,650 Views

I'm bringing this back up again because the page I referred to was updated August 14, 2015 and still refers to a 25MB limit:

 

The maximum size of an email cannot exceed 25 MB; this includes attachments, headers, text, formatting, etc

 

So, once again, I am asking for confirmation on the 35MB size.




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Posted by
Official Employee

Message 9 of 12
1,636 Views

Same answer as above.   MIME encoding adds about 33% to the size of a message.  We state the maximum be about 25MB for attachments.  When you attach a large file. and it is then encoded for attachment, it reaches the internal maximum of about 35MB. 




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Posted by
Service Expert

Message 10 of 12
1,628 Views

So, then, is the webpage wrong? Should we stick with saying 25MB, or tell customers it's actually 35MB?




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Posted by
Official Employee

Message 11 of 12
1,622 Views

You should tell them approximately 25MB.  They cannot to take a 35MB (on-disk size) and send that through comcast.net systems.  That's not how MIME encoding works.  The 35MB attachment would become about 47MB or so, and that's way over our limit.




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Posted by
Service Expert

Message 12 of 12
1,620 Views

Thanks, Dave.




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