"Please advise" is correct English, but as a default email closer it usually lands cold. To a native ear, a bare "Please advise" is a formal, Latinate command with no specific question attached, so it reads as curt or faintly passive-aggressive — close to the email version of "well?". It fits one situation: a genuinely formal request for a recommendation. As a reflex sign-off on every email, swap it for "Let me know what you think," "Let me know how you'd like to proceed," or just ask your specific question.
The instinct behind it is good. You want to sound professional and leave the decision to the reader, and "Please advise" is drilled in as the safe, neutral business closer. The trouble is that native speakers rarely close this way, so a phrase you mean as polished comes across colder than you intend.
The fix is to name what you want a response on, hand the reader a clear choice, or skip the closer and ask the actual question.
Say what you actually want a reply on instead of defaulting to the formal closer:
Instead of
"Please advise."
Write
"Let me know what you think."
This names what you want a response on and invites a reply, instead of issuing a command that lands curt.
Instead of
"Please advise on how to proceed."
Write
"Let me know how you'd like to proceed."
This hands the reader a clear decision in a friendly way, rather than a bare formal directive.
Instead of
"Please advise." (with the real question left unstated)
Write
"Should I go ahead and book the Tuesday slot, or wait for the budget sign-off?"
Asking the specific question directly gets a faster, clearer answer than a vague closer that leaves the reader guessing what you need.
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