SY
SY definition by Slang.net - The Slang Dictionary
This page explains what the acronym "SY" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When used at the end of an email, SY stands for "sincerely yours." It's a quick way to abbreviate what is many writers' standard email sign-off.
A friend or family member who ends an email with SY likely means it, and has written you an honest, heartfelt message. (Which you should respond to sometime, huh?) Anyone else who ends an email with SY is likely using it as a simple platitude (as most of us do).