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Anybody know what the maximum length of an email's subject line can
be?
The subject is an unstructured field so it has no maximum length.
While technically true, keep in mind there's a difference between RFC limits, and practical limits. For example, I just tried an email with a 1500 character subject line, folded per the spec. Exchange ate it just fine, and showed me the whole subject in outlook web access, but Outlook 2003 only showed the 255 characters. MAPI handled it fine because it was relayed to my palm w/the complete text. And gmail took it ok. So in short, if you've going with something "really long" make sure you've tested well. -Walden
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