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Too Big to Mail

February 15, 2011

Despite the proliferation of file sending services like YouSendIt and shared cloud drives like Dropbox, e-mail remains for many the most convenient way to exchange small to moderate-sized files. But how big is moderate? Too big and your mail fails, either on its way up to your outbound server or on its way in to the recipient’s mailbox. File size limits are determined by your internet service provider and often by other gateways like in-house mail servers.

Like most policies of large communications services providers, e-mail file size limits are difficult to find and interpret. Many ISPs change their rules depending on the level of subscriber service. We assembled the list below from online and phone help desks at major U.S. broadband providers. For a definitive number, you may have to contact your ISP’s help desk.

AT&T: 25 Mb (webmail), 10 Mb (client)
Cable One: 10 Mb
CenturyLink: 10 Mb
Charter: 10 Mb
Comcast: 15 Mb
Cox: 10 Mb
EarthLink: 10 Mb (webmail), 5 Mb (client)
Frontier: 3 Mb
Gmail: 25 Mb
Qwest: 10 Mb
Time Warner Cable/Road Runner: 20 Mb
Verizon:  8 Mb (webmail), 20 Mb (client)
Bright House Networks/Road Runner: 20 Mb
Windstream: 1Gb
Optimum Online/Cablevision: 20 Mb

Posted by Postbox