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E-Mail Size Limits?
Technoman asks: "I work for a company that for the past four years has restricted individual e-mail messages to 5 meg each. We now have users suggesting that this limit is to small and hinders them in performing their job. I would like to know how others are using size limits, and if not how they deal with large e-mails." As human communication over the net becomes more and more complex, the "acceptable size" of an email message will increase. 10 years ago, if you got an email over 10k, something was seriously amiss; but these days, that is just a flash in the pan. Many people rely on email, not FTP to transfer files, and things like a few family portraits can easily exceed several megs in size, so drawing the line for all users may not be as easy as you think, depending on your users and your network. Put simply, if you were the administrator of an e-mail server, what would you set the maximum size of an incoming email message to be, and what would be the reasoning behind said limit?
I have to agree with previous posts. Email is not a file transfer protocol, it's a mail protocol. It's designed for text. If you want to send files, use a protocol that was designed for it like FTP, HTTP, or DCC file transfer.
If your company is smart they use an instant messenger. If not, I suggest you use one. Using an instant messenger users can send files between each other without going through servers.
Don't duplicate work, check out the horde project. They have an excellent file manager for web use, coded in php.
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It's nice for all of us as geeks to say "make the users use FTP" (though frankly, I'd prefer scp or nothing), but it isn't practical.
I work in a not-for-profit that publishes a weekly journal, so we are both "an academic environment" (we operate somewhat like a unversity), and a good-size for-profit company. To that end, the requirements of our user community are very different.
We used to traffic a lot of paper and film via FedEx and couriers, and moving all that processing to electronic mediums saves us over $300k/year. I should know, I had a big hand in implementing our digital workflow (why do you think they bought me an Aibo?). Our technology spending isn't any more than it was when everything was paper based, but our saving have been huge.
We use Groupwise for corporate email, and the post offices live on a SAN virtual disk. Our SAN has over 2TB in storage, Netware lets you concat volume segments dynamically, and Groupwise only stores a message once in the database and passes pointers to each internal recipient. So storing large attachments is very efficient, and enlarging the post offices is trivial. Our SAN is only 33% populated, and smaller drives (75GB) can be replaced on the fly with larger drives (180GB) and the array will resize and rebuild itself hot.
So we have no inbound or outbound attachment limit, though we do keep an eye on things to make sure people don't go nuts. We just upgraded our servers last weekend after 2 1/2 years in service, despite our post offices growing by a factor of 10. Having administered Exchange, Notes, and Groupwise, I think we've got the best of the three groupware packages, and our users are happy enough (they would be happy, but who is every happy at the phone company because they have a dial tone?)
In three years, we did turn up our bandwidth from (2) T-1s to a 6mbt fractional DS-3, but email only accounts for a small portion of that traffic (we host half a dozen more websites than we used to).
The largest attachment I ever emailed was probably 100MB, and I honestly find 5MB limits to be draconian. We have an FTP drop, but our vendors won't use it. Last month, I had to email a vendor a dat tape with 13MB of data because they have a 5MB attachment limit. Sick.
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It's genenerally not a 5M limit on mail BOXES, but individual messages.
With modern mail stores, mail box limits of 100M / user is fairly realistic, although you can KILL your mail server if you use POP with frequent checks and "leave mail on the server" options.
5M is a resonable max to expect someone to get over a modem, although that's pretty bad too.
In most sane email servers, a 10MB attachment sent to 200 people would take up ... 10MB plus pointers. What are you using?
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